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wdenkc6097192002-11-03 00:24:07 +00001#
Wolfgang Denk218ca722008-03-26 10:40:12 +01002# (C) Copyright 2000 - 2008
wdenkc6097192002-11-03 00:24:07 +00003# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4#
5# See file CREDITS for list of people who contributed to this
6# project.
7#
8# This program is free software; you can redistribute it and/or
9# modify it under the terms of the GNU General Public License as
10# published by the Free Software Foundation; either version 2 of
11# the License, or (at your option) any later version.
12#
13# This program is distributed in the hope that it will be useful,
14# but WITHOUT ANY WARRANTY; without even the implied warranty of
15# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16# GNU General Public License for more details.
17#
18# You should have received a copy of the GNU General Public License
19# along with this program; if not, write to the Free Software
20# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21# MA 02111-1307 USA
22#
23
24Summary:
25========
26
wdenk24ee89b2002-11-03 17:56:27 +000027This directory contains the source code for U-Boot, a boot loader for
wdenke86e5a02004-10-17 21:12:06 +000028Embedded boards based on PowerPC, ARM, MIPS and several other
29processors, which can be installed in a boot ROM and used to
30initialize and test the hardware or to download and run application
31code.
wdenkc6097192002-11-03 00:24:07 +000032
33The development of U-Boot is closely related to Linux: some parts of
wdenk24ee89b2002-11-03 17:56:27 +000034the source code originate in the Linux source tree, we have some
35header files in common, and special provision has been made to
wdenkc6097192002-11-03 00:24:07 +000036support booting of Linux images.
37
38Some attention has been paid to make this software easily
39configurable and extendable. For instance, all monitor commands are
40implemented with the same call interface, so that it's very easy to
41add new commands. Also, instead of permanently adding rarely used
42code (for instance hardware test utilities) to the monitor, you can
43load and run it dynamically.
44
45
46Status:
47=======
48
49In general, all boards for which a configuration option exists in the
wdenk24ee89b2002-11-03 17:56:27 +000050Makefile have been tested to some extent and can be considered
wdenkc6097192002-11-03 00:24:07 +000051"working". In fact, many of them are used in production systems.
52
wdenk24ee89b2002-11-03 17:56:27 +000053In case of problems see the CHANGELOG and CREDITS files to find out
Wolfgang Denk218ca722008-03-26 10:40:12 +010054who contributed the specific port. The MAINTAINERS file lists board
55maintainers.
wdenkc6097192002-11-03 00:24:07 +000056
wdenkc6097192002-11-03 00:24:07 +000057
58Where to get help:
59==================
60
wdenk24ee89b2002-11-03 17:56:27 +000061In case you have questions about, problems with or contributions for
62U-Boot you should send a message to the U-Boot mailing list at
63<u-boot-users@lists.sourceforge.net>. There is also an archive of
64previous traffic on the mailing list - please search the archive
wdenkc6097192002-11-03 00:24:07 +000065before asking FAQ's. Please see
66http://lists.sourceforge.net/lists/listinfo/u-boot-users/
67
68
Wolfgang Denk218ca722008-03-26 10:40:12 +010069Where to get source code:
70=========================
71
72The U-Boot source code is maintained in the git repository at
73git://www.denx.de/git/u-boot.git ; you can browse it online at
74http://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary
75
76The "snapshot" links on this page allow you to download tarballs of
Marcel Ziswiler11ccc332008-07-09 08:17:15 +020077any version you might be interested in. Official releases are also
Wolfgang Denk218ca722008-03-26 10:40:12 +010078available for FTP download from the ftp://ftp.denx.de/pub/u-boot/
79directory.
80
Anatolij Gustschind4ee7112008-03-26 18:13:33 +010081Pre-built (and tested) images are available from
Wolfgang Denk218ca722008-03-26 10:40:12 +010082ftp://ftp.denx.de/pub/u-boot/images/
83
84
wdenkc6097192002-11-03 00:24:07 +000085Where we come from:
86===================
87
88- start from 8xxrom sources
wdenk24ee89b2002-11-03 17:56:27 +000089- create PPCBoot project (http://sourceforge.net/projects/ppcboot)
wdenkc6097192002-11-03 00:24:07 +000090- clean up code
91- make it easier to add custom boards
92- make it possible to add other [PowerPC] CPUs
93- extend functions, especially:
94 * Provide extended interface to Linux boot loader
95 * S-Record download
96 * network boot
Marcel Ziswiler11ccc332008-07-09 08:17:15 +020097 * PCMCIA / CompactFlash / ATA disk / SCSI ... boot
wdenk24ee89b2002-11-03 17:56:27 +000098- create ARMBoot project (http://sourceforge.net/projects/armboot)
wdenkc6097192002-11-03 00:24:07 +000099- add other CPU families (starting with ARM)
wdenk24ee89b2002-11-03 17:56:27 +0000100- create U-Boot project (http://sourceforge.net/projects/u-boot)
Wolfgang Denk218ca722008-03-26 10:40:12 +0100101- current project page: see http://www.denx.de/wiki/UBoot
wdenk24ee89b2002-11-03 17:56:27 +0000102
103
104Names and Spelling:
105===================
106
107The "official" name of this project is "Das U-Boot". The spelling
108"U-Boot" shall be used in all written text (documentation, comments
109in source files etc.). Example:
110
111 This is the README file for the U-Boot project.
112
113File names etc. shall be based on the string "u-boot". Examples:
114
115 include/asm-ppc/u-boot.h
116
117 #include <asm/u-boot.h>
118
119Variable names, preprocessor constants etc. shall be either based on
120the string "u_boot" or on "U_BOOT". Example:
121
122 U_BOOT_VERSION u_boot_logo
123 IH_OS_U_BOOT u_boot_hush_start
wdenkc6097192002-11-03 00:24:07 +0000124
125
wdenk93f19cc2002-12-17 17:55:09 +0000126Versioning:
127===========
128
129U-Boot uses a 3 level version number containing a version, a
130sub-version, and a patchlevel: "U-Boot-2.34.5" means version "2",
131sub-version "34", and patchlevel "4".
132
133The patchlevel is used to indicate certain stages of development
134between released versions, i. e. officially released versions of
135U-Boot will always have a patchlevel of "0".
136
137
wdenkc6097192002-11-03 00:24:07 +0000138Directory Hierarchy:
139====================
140
wdenk7152b1d2003-09-05 23:19:14 +0000141- board Board dependent files
142- common Misc architecture independent functions
wdenkc6097192002-11-03 00:24:07 +0000143- cpu CPU specific files
wdenk983fda82004-10-28 00:09:35 +0000144 - 74xx_7xx Files specific to Freescale MPC74xx and 7xx CPUs
wdenk11dadd52004-02-27 00:07:27 +0000145 - arm720t Files specific to ARM 720 CPUs
146 - arm920t Files specific to ARM 920 CPUs
wdenka85f9f22005-04-06 13:52:31 +0000147 - at91rm9200 Files specific to Atmel AT91RM9200 CPU
wdenk983fda82004-10-28 00:09:35 +0000148 - imx Files specific to Freescale MC9328 i.MX CPUs
wdenk1d9f4102004-10-09 22:21:29 +0000149 - s3c24x0 Files specific to Samsung S3C24X0 CPUs
wdenk11dadd52004-02-27 00:07:27 +0000150 - arm925t Files specific to ARM 925 CPUs
151 - arm926ejs Files specific to ARM 926 CPUs
wdenk8ed96042005-01-09 23:16:25 +0000152 - arm1136 Files specific to ARM 1136 CPUs
Wolfgang Denk72a087e2006-10-24 14:27:35 +0200153 - at32ap Files specific to Atmel AVR32 AP CPUs
wdenk11dadd52004-02-27 00:07:27 +0000154 - i386 Files specific to i386 CPUs
155 - ixp Files specific to Intel XScale IXP CPUs
Daniel Hellstromb3309902008-03-28 10:00:33 +0100156 - leon2 Files specific to Gaisler LEON2 SPARC CPU
Daniel Hellstrom1e9a1642008-03-26 22:51:29 +0100157 - leon3 Files specific to Gaisler LEON3 SPARC CPU
wdenk983fda82004-10-28 00:09:35 +0000158 - mcf52x2 Files specific to Freescale ColdFire MCF52x2 CPUs
TsiChungLiew1552af72008-01-14 17:43:33 -0600159 - mcf5227x Files specific to Freescale ColdFire MCF5227x CPUs
TsiChung Liew8e585f02007-06-18 13:50:13 -0500160 - mcf532x Files specific to Freescale ColdFire MCF5329 CPUs
TsiChungLiew8ae158c2007-08-16 15:05:11 -0500161 - mcf5445x Files specific to Freescale ColdFire MCF5445x CPUs
TsiChungLiew57a12722008-01-15 14:15:46 -0600162 - mcf547x_8x Files specific to Freescale ColdFire MCF547x_8x CPUs
wdenk11dadd52004-02-27 00:07:27 +0000163 - mips Files specific to MIPS CPUs
wdenk983fda82004-10-28 00:09:35 +0000164 - mpc5xx Files specific to Freescale MPC5xx CPUs
165 - mpc5xxx Files specific to Freescale MPC5xxx CPUs
166 - mpc8xx Files specific to Freescale MPC8xx CPUs
167 - mpc8220 Files specific to Freescale MPC8220 CPUs
168 - mpc824x Files specific to Freescale MPC824x CPUs
169 - mpc8260 Files specific to Freescale MPC8260 CPUs
170 - mpc85xx Files specific to Freescale MPC85xx CPUs
wdenk11dadd52004-02-27 00:07:27 +0000171 - nios Files specific to Altera NIOS CPUs
wdenk5c952cf2004-10-10 21:27:30 +0000172 - nios2 Files specific to Altera Nios-II CPUs
Wolfgang Denk0c8721a2005-09-23 11:05:55 +0200173 - ppc4xx Files specific to AMCC PowerPC 4xx CPUs
wdenk11dadd52004-02-27 00:07:27 +0000174 - pxa Files specific to Intel XScale PXA CPUs
175 - s3c44b0 Files specific to Samsung S3C44B0 CPUs
176 - sa1100 Files specific to Intel StrongARM SA1100 CPUs
wdenkc6097192002-11-03 00:24:07 +0000177- disk Code for disk drive partition handling
178- doc Documentation (don't expect too much)
wdenk7152b1d2003-09-05 23:19:14 +0000179- drivers Commonly used device drivers
wdenkc6097192002-11-03 00:24:07 +0000180- dtt Digital Thermometer and Thermostat drivers
181- examples Example code for standalone applications, etc.
182- include Header Files
wdenk11dadd52004-02-27 00:07:27 +0000183- lib_arm Files generic to ARM architecture
Wolfgang Denk7b64fef2006-10-24 14:21:16 +0200184- lib_avr32 Files generic to AVR32 architecture
wdenk11dadd52004-02-27 00:07:27 +0000185- lib_generic Files generic to all architectures
186- lib_i386 Files generic to i386 architecture
187- lib_m68k Files generic to m68k architecture
188- lib_mips Files generic to MIPS architecture
189- lib_nios Files generic to NIOS architecture
190- lib_ppc Files generic to PowerPC architecture
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100191- lib_sparc Files generic to SPARC architecture
Wolfgang Denk218ca722008-03-26 10:40:12 +0100192- libfdt Library files to support flattened device trees
wdenkc6097192002-11-03 00:24:07 +0000193- net Networking code
wdenkc6097192002-11-03 00:24:07 +0000194- post Power On Self Test
wdenkc6097192002-11-03 00:24:07 +0000195- rtc Real Time Clock drivers
196- tools Tools to build S-Record or U-Boot images, etc.
197
wdenkc6097192002-11-03 00:24:07 +0000198Software Configuration:
199=======================
200
201Configuration is usually done using C preprocessor defines; the
202rationale behind that is to avoid dead code whenever possible.
203
204There are two classes of configuration variables:
205
206* Configuration _OPTIONS_:
207 These are selectable by the user and have names beginning with
208 "CONFIG_".
209
210* Configuration _SETTINGS_:
211 These depend on the hardware etc. and should not be meddled with if
212 you don't know what you're doing; they have names beginning with
213 "CFG_".
214
215Later we will add a configuration tool - probably similar to or even
216identical to what's used for the Linux kernel. Right now, we have to
217do the configuration by hand, which means creating some symbolic
218links and editing some configuration files. We use the TQM8xxL boards
219as an example here.
220
221
222Selection of Processor Architecture and Board Type:
223---------------------------------------------------
224
225For all supported boards there are ready-to-use default
226configurations available; just type "make <board_name>_config".
227
228Example: For a TQM823L module type:
229
230 cd u-boot
231 make TQM823L_config
232
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200233For the Cogent platform, you need to specify the CPU type as well;
wdenkc6097192002-11-03 00:24:07 +0000234e.g. "make cogent_mpc8xx_config". And also configure the cogent
235directory according to the instructions in cogent/README.
236
237
238Configuration Options:
239----------------------
240
241Configuration depends on the combination of board and CPU type; all
242such information is kept in a configuration file
243"include/configs/<board_name>.h".
244
245Example: For a TQM823L module, all configuration settings are in
246"include/configs/TQM823L.h".
247
248
wdenk7f6c2cb2002-11-10 22:06:23 +0000249Many of the options are named exactly as the corresponding Linux
250kernel configuration options. The intention is to make it easier to
251build a config tool - later.
252
253
wdenkc6097192002-11-03 00:24:07 +0000254The following options need to be configured:
255
Kim Phillips26281142007-08-10 13:28:25 -0500256- CPU Type: Define exactly one, e.g. CONFIG_MPC85XX.
wdenkc6097192002-11-03 00:24:07 +0000257
Kim Phillips26281142007-08-10 13:28:25 -0500258- Board Type: Define exactly one, e.g. CONFIG_MPC8540ADS.
Wolfgang Denk6ccec442006-10-24 14:42:37 +0200259
260- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
Haavard Skinnemoen09ea0de2007-11-01 12:44:20 +0100261 Define exactly one, e.g. CONFIG_ATSTK1002
wdenkc6097192002-11-03 00:24:07 +0000262
263- CPU Module Type: (if CONFIG_COGENT is defined)
264 Define exactly one of
265 CONFIG_CMA286_60_OLD
266--- FIXME --- not tested yet:
267 CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
268 CONFIG_CMA287_23, CONFIG_CMA287_50
269
270- Motherboard Type: (if CONFIG_COGENT is defined)
271 Define exactly one of
272 CONFIG_CMA101, CONFIG_CMA102
273
274- Motherboard I/O Modules: (if CONFIG_COGENT is defined)
275 Define one or more of
276 CONFIG_CMA302
277
278- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
279 Define one or more of
280 CONFIG_LCD_HEARTBEAT - update a character position on
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200281 the LCD display every second with
wdenkc6097192002-11-03 00:24:07 +0000282 a "rotator" |\-/|\-/
283
wdenk2535d602003-07-17 23:16:40 +0000284- Board flavour: (if CONFIG_MPC8260ADS is defined)
285 CONFIG_ADSTYPE
286 Possible values are:
287 CFG_8260ADS - original MPC8260ADS
wdenk180d3f72004-01-04 16:28:35 +0000288 CFG_8266ADS - MPC8266ADS
wdenk54387ac2003-10-08 22:45:44 +0000289 CFG_PQ2FADS - PQ2FADS-ZU or PQ2FADS-VR
wdenk04a85b32004-04-15 18:22:41 +0000290 CFG_8272ADS - MPC8272ADS
wdenk2535d602003-07-17 23:16:40 +0000291
wdenkc6097192002-11-03 00:24:07 +0000292- MPC824X Family Member (if CONFIG_MPC824X is defined)
wdenk5da627a2003-10-09 20:09:04 +0000293 Define exactly one of
294 CONFIG_MPC8240, CONFIG_MPC8245
wdenkc6097192002-11-03 00:24:07 +0000295
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200296- 8xx CPU Options: (if using an MPC8xx CPU)
wdenk66ca92a2004-09-28 17:59:53 +0000297 CONFIG_8xx_GCLK_FREQ - deprecated: CPU clock if
298 get_gclk_freq() cannot work
wdenk5da627a2003-10-09 20:09:04 +0000299 e.g. if there is no 32KHz
300 reference PIT/RTC clock
wdenk66ca92a2004-09-28 17:59:53 +0000301 CONFIG_8xx_OSCLK - PLL input clock (either EXTCLK
302 or XTAL/EXTAL)
wdenkc6097192002-11-03 00:24:07 +0000303
wdenk66ca92a2004-09-28 17:59:53 +0000304- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
305 CFG_8xx_CPUCLK_MIN
306 CFG_8xx_CPUCLK_MAX
307 CONFIG_8xx_CPUCLK_DEFAULT
wdenk75d1ea72004-01-31 20:06:54 +0000308 See doc/README.MPC866
309
310 CFG_MEASURE_CPUCLK
311
wdenkba56f622004-02-06 23:19:44 +0000312 Define this to measure the actual CPU clock instead
313 of relying on the correctness of the configured
314 values. Mostly useful for board bringup to make sure
315 the PLL is locked at the intended frequency. Note
316 that this requires a (stable) reference clock (32 kHz
wdenk66ca92a2004-09-28 17:59:53 +0000317 RTC clock or CFG_8XX_XIN)
wdenk75d1ea72004-01-31 20:06:54 +0000318
Markus Klotzbuecher0b953ff2006-03-24 15:28:02 +0100319- Intel Monahans options:
320 CFG_MONAHANS_RUN_MODE_OSC_RATIO
321
322 Defines the Monahans run mode to oscillator
323 ratio. Valid values are 8, 16, 24, 31. The core
324 frequency is this value multiplied by 13 MHz.
325
326 CFG_MONAHANS_TURBO_RUN_MODE_RATIO
Wolfgang Denkcf48eb92006-04-16 10:51:58 +0200327
Markus Klotzbuecher0b953ff2006-03-24 15:28:02 +0100328 Defines the Monahans turbo mode to oscillator
329 ratio. Valid values are 1 (default if undefined) and
Wolfgang Denkcf48eb92006-04-16 10:51:58 +0200330 2. The core frequency as calculated above is multiplied
Markus Klotzbuecher0b953ff2006-03-24 15:28:02 +0100331 by this value.
Wolfgang Denkcf48eb92006-04-16 10:51:58 +0200332
wdenk5da627a2003-10-09 20:09:04 +0000333- Linux Kernel Interface:
wdenkc6097192002-11-03 00:24:07 +0000334 CONFIG_CLOCKS_IN_MHZ
335
336 U-Boot stores all clock information in Hz
337 internally. For binary compatibility with older Linux
338 kernels (which expect the clocks passed in the
339 bd_info data to be in MHz) the environment variable
340 "clocks_in_mhz" can be defined so that U-Boot
341 converts clock data to MHZ before passing it to the
342 Linux kernel.
wdenkc6097192002-11-03 00:24:07 +0000343 When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
Wolfgang Denk218ca722008-03-26 10:40:12 +0100344 "clocks_in_mhz=1" is automatically included in the
wdenkc6097192002-11-03 00:24:07 +0000345 default environment.
346
wdenk5da627a2003-10-09 20:09:04 +0000347 CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only]
348
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200349 When transferring memsize parameter to linux, some versions
wdenk5da627a2003-10-09 20:09:04 +0000350 expect it to be in bytes, others in MB.
351 Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
352
Gerald Van Barenfec6d9e2008-06-03 20:34:45 -0400353 CONFIG_OF_LIBFDT
Wolfgang Denkf57f70a2005-10-13 01:45:54 +0200354
355 New kernel versions are expecting firmware settings to be
Gerald Van Baren213bf8c2007-03-31 12:23:51 -0400356 passed using flattened device trees (based on open firmware
357 concepts).
358
359 CONFIG_OF_LIBFDT
360 * New libfdt-based support
361 * Adds the "fdt" command
Kim Phillips3bb342f2007-08-10 14:34:14 -0500362 * The bootm command automatically updates the fdt
Gerald Van Baren213bf8c2007-03-31 12:23:51 -0400363
Wolfgang Denkf57f70a2005-10-13 01:45:54 +0200364 OF_CPU - The proper name of the cpus node.
Kumar Galac2871f02006-01-11 13:59:02 -0600365 OF_SOC - The proper name of the soc node.
Wolfgang Denkf57f70a2005-10-13 01:45:54 +0200366 OF_TBCLK - The timebase frequency.
Kumar Galac2871f02006-01-11 13:59:02 -0600367 OF_STDOUT_PATH - The path to the console device
Wolfgang Denkf57f70a2005-10-13 01:45:54 +0200368
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200369 boards with QUICC Engines require OF_QE to set UCC MAC
370 addresses
Kim Phillips3bb342f2007-08-10 14:34:14 -0500371
Kumar Gala4e253132006-01-11 13:54:17 -0600372 CONFIG_OF_BOARD_SETUP
373
374 Board code has addition modification that it wants to make
375 to the flat device tree before handing it off to the kernel
wdenk6705d812004-08-02 23:22:59 +0000376
Matthew McClintock02677682006-06-28 10:41:37 -0500377 CONFIG_OF_BOOT_CPU
378
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200379 This define fills in the correct boot CPU in the boot
Matthew McClintock02677682006-06-28 10:41:37 -0500380 param header, the default value is zero if undefined.
381
wdenk6705d812004-08-02 23:22:59 +0000382- Serial Ports:
383 CFG_PL010_SERIAL
384
385 Define this if you want support for Amba PrimeCell PL010 UARTs.
386
387 CFG_PL011_SERIAL
388
389 Define this if you want support for Amba PrimeCell PL011 UARTs.
390
391 CONFIG_PL011_CLOCK
392
393 If you have Amba PrimeCell PL011 UARTs, set this variable to
394 the clock speed of the UARTs.
395
396 CONFIG_PL01x_PORTS
397
398 If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
399 define this to a list of base addresses for each (supported)
400 port. See e.g. include/configs/versatile.h
401
402
wdenkc6097192002-11-03 00:24:07 +0000403- Console Interface:
wdenk43d96162003-03-06 00:02:04 +0000404 Depending on board, define exactly one serial port
405 (like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
406 CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
407 console by defining CONFIG_8xx_CONS_NONE
wdenkc6097192002-11-03 00:24:07 +0000408
409 Note: if CONFIG_8xx_CONS_NONE is defined, the serial
410 port routines must be defined elsewhere
411 (i.e. serial_init(), serial_getc(), ...)
412
413 CONFIG_CFB_CONSOLE
414 Enables console device for a color framebuffer. Needs following
415 defines (cf. smiLynxEM, i8042, board/eltec/bab7xx)
416 VIDEO_FB_LITTLE_ENDIAN graphic memory organisation
417 (default big endian)
418 VIDEO_HW_RECTFILL graphic chip supports
419 rectangle fill
420 (cf. smiLynxEM)
421 VIDEO_HW_BITBLT graphic chip supports
422 bit-blit (cf. smiLynxEM)
423 VIDEO_VISIBLE_COLS visible pixel columns
424 (cols=pitch)
wdenkba56f622004-02-06 23:19:44 +0000425 VIDEO_VISIBLE_ROWS visible pixel rows
426 VIDEO_PIXEL_SIZE bytes per pixel
wdenkc6097192002-11-03 00:24:07 +0000427 VIDEO_DATA_FORMAT graphic data format
428 (0-5, cf. cfb_console.c)
wdenkba56f622004-02-06 23:19:44 +0000429 VIDEO_FB_ADRS framebuffer address
wdenkc6097192002-11-03 00:24:07 +0000430 VIDEO_KBD_INIT_FCT keyboard int fct
431 (i.e. i8042_kbd_init())
432 VIDEO_TSTC_FCT test char fct
433 (i.e. i8042_tstc)
434 VIDEO_GETC_FCT get char fct
435 (i.e. i8042_getc)
436 CONFIG_CONSOLE_CURSOR cursor drawing on/off
437 (requires blink timer
438 cf. i8042.c)
439 CFG_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
440 CONFIG_CONSOLE_TIME display time/date info in
441 upper right corner
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500442 (requires CONFIG_CMD_DATE)
wdenkc6097192002-11-03 00:24:07 +0000443 CONFIG_VIDEO_LOGO display Linux logo in
444 upper left corner
wdenka6c7ad22002-12-03 21:28:10 +0000445 CONFIG_VIDEO_BMP_LOGO use bmp_logo.h instead of
446 linux_logo.h for logo.
447 Requires CONFIG_VIDEO_LOGO
wdenkc6097192002-11-03 00:24:07 +0000448 CONFIG_CONSOLE_EXTRA_INFO
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200449 additional board info beside
wdenkc6097192002-11-03 00:24:07 +0000450 the logo
451
wdenk43d96162003-03-06 00:02:04 +0000452 When CONFIG_CFB_CONSOLE is defined, video console is
453 default i/o. Serial console can be forced with
454 environment 'console=serial'.
wdenkc6097192002-11-03 00:24:07 +0000455
wdenkd4ca31c2004-01-02 14:00:00 +0000456 When CONFIG_SILENT_CONSOLE is defined, all console
457 messages (by U-Boot and Linux!) can be silenced with
458 the "silent" environment variable. See
459 doc/README.silent for more information.
wdenka3ad8e22003-10-19 23:22:11 +0000460
wdenkc6097192002-11-03 00:24:07 +0000461- Console Baudrate:
462 CONFIG_BAUDRATE - in bps
463 Select one of the baudrates listed in
464 CFG_BAUDRATE_TABLE, see below.
wdenk3bbc8992003-12-07 22:27:15 +0000465 CFG_BRGCLK_PRESCALE, baudrate prescale
wdenkc6097192002-11-03 00:24:07 +0000466
467- Interrupt driven serial port input:
468 CONFIG_SERIAL_SOFTWARE_FIFO
469
470 PPC405GP only.
471 Use an interrupt handler for receiving data on the
472 serial port. It also enables using hardware handshake
473 (RTS/CTS) and UART's built-in FIFO. Set the number of
474 bytes the interrupt driven input buffer should have.
475
wdenk109c0e32004-03-23 21:43:07 +0000476 Leave undefined to disable this feature, including
477 disable the buffer and hardware handshake.
wdenkc6097192002-11-03 00:24:07 +0000478
stroese1d49b1f2003-05-23 11:39:05 +0000479- Console UART Number:
480 CONFIG_UART1_CONSOLE
481
Wolfgang Denk0c8721a2005-09-23 11:05:55 +0200482 AMCC PPC4xx only.
stroese1d49b1f2003-05-23 11:39:05 +0000483 If defined internal UART1 (and not UART0) is used
484 as default U-Boot console.
485
wdenkc6097192002-11-03 00:24:07 +0000486- Boot Delay: CONFIG_BOOTDELAY - in seconds
487 Delay before automatically booting the default image;
488 set to -1 to disable autoboot.
489
490 See doc/README.autoboot for these options that
491 work with CONFIG_BOOTDELAY. None are required.
492 CONFIG_BOOT_RETRY_TIME
493 CONFIG_BOOT_RETRY_MIN
494 CONFIG_AUTOBOOT_KEYED
495 CONFIG_AUTOBOOT_PROMPT
496 CONFIG_AUTOBOOT_DELAY_STR
497 CONFIG_AUTOBOOT_STOP_STR
498 CONFIG_AUTOBOOT_DELAY_STR2
499 CONFIG_AUTOBOOT_STOP_STR2
500 CONFIG_ZERO_BOOTDELAY_CHECK
501 CONFIG_RESET_TO_RETRY
502
503- Autoboot Command:
504 CONFIG_BOOTCOMMAND
505 Only needed when CONFIG_BOOTDELAY is enabled;
506 define a command string that is automatically executed
507 when no character is read on the console interface
508 within "Boot Delay" after reset.
509
510 CONFIG_BOOTARGS
wdenk43d96162003-03-06 00:02:04 +0000511 This can be used to pass arguments to the bootm
512 command. The value of CONFIG_BOOTARGS goes into the
513 environment value "bootargs".
wdenkc6097192002-11-03 00:24:07 +0000514
515 CONFIG_RAMBOOT and CONFIG_NFSBOOT
wdenk43d96162003-03-06 00:02:04 +0000516 The value of these goes into the environment as
517 "ramboot" and "nfsboot" respectively, and can be used
518 as a convenience, when switching between booting from
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200519 RAM and NFS.
wdenkc6097192002-11-03 00:24:07 +0000520
521- Pre-Boot Commands:
522 CONFIG_PREBOOT
523
524 When this option is #defined, the existence of the
525 environment variable "preboot" will be checked
526 immediately before starting the CONFIG_BOOTDELAY
527 countdown and/or running the auto-boot command resp.
528 entering interactive mode.
529
530 This feature is especially useful when "preboot" is
531 automatically generated or modified. For an example
532 see the LWMON board specific code: here "preboot" is
533 modified when the user holds down a certain
534 combination of keys on the (special) keyboard when
535 booting the systems
536
537- Serial Download Echo Mode:
538 CONFIG_LOADS_ECHO
539 If defined to 1, all characters received during a
540 serial download (using the "loads" command) are
541 echoed back. This might be needed by some terminal
542 emulations (like "cu"), but may as well just take
543 time on others. This setting #define's the initial
544 value of the "loads_echo" environment variable.
545
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500546- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
wdenkc6097192002-11-03 00:24:07 +0000547 CONFIG_KGDB_BAUDRATE
548 Select one of the baudrates listed in
549 CFG_BAUDRATE_TABLE, see below.
550
551- Monitor Functions:
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500552 Monitor commands can be included or excluded
553 from the build by using the #include files
554 "config_cmd_all.h" and #undef'ing unwanted
555 commands, or using "config_cmd_default.h"
556 and augmenting with additional #define's
557 for wanted commands.
wdenkc6097192002-11-03 00:24:07 +0000558
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500559 The default command configuration includes all commands
560 except those marked below with a "*".
wdenkc6097192002-11-03 00:24:07 +0000561
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500562 CONFIG_CMD_ASKENV * ask for env variable
563 CONFIG_CMD_AUTOSCRIPT Autoscript Support
564 CONFIG_CMD_BDI bdinfo
565 CONFIG_CMD_BEDBUG * Include BedBug Debugger
566 CONFIG_CMD_BMP * BMP support
567 CONFIG_CMD_BSP * Board specific commands
568 CONFIG_CMD_BOOTD bootd
569 CONFIG_CMD_CACHE * icache, dcache
570 CONFIG_CMD_CONSOLE coninfo
571 CONFIG_CMD_DATE * support for RTC, date/time...
572 CONFIG_CMD_DHCP * DHCP support
573 CONFIG_CMD_DIAG * Diagnostics
574 CONFIG_CMD_DOC * Disk-On-Chip Support
575 CONFIG_CMD_DTT * Digital Therm and Thermostat
576 CONFIG_CMD_ECHO echo arguments
577 CONFIG_CMD_EEPROM * EEPROM read/write support
578 CONFIG_CMD_ELF * bootelf, bootvx
579 CONFIG_CMD_ENV saveenv
580 CONFIG_CMD_FDC * Floppy Disk Support
581 CONFIG_CMD_FAT * FAT partition support
582 CONFIG_CMD_FDOS * Dos diskette Support
583 CONFIG_CMD_FLASH flinfo, erase, protect
584 CONFIG_CMD_FPGA FPGA device initialization support
585 CONFIG_CMD_HWFLOW * RTS/CTS hw flow control
586 CONFIG_CMD_I2C * I2C serial bus support
587 CONFIG_CMD_IDE * IDE harddisk support
588 CONFIG_CMD_IMI iminfo
589 CONFIG_CMD_IMLS List all found images
590 CONFIG_CMD_IMMAP * IMMR dump support
591 CONFIG_CMD_IRQ * irqinfo
592 CONFIG_CMD_ITEST Integer/string test of 2 values
593 CONFIG_CMD_JFFS2 * JFFS2 Support
594 CONFIG_CMD_KGDB * kgdb
595 CONFIG_CMD_LOADB loadb
596 CONFIG_CMD_LOADS loads
597 CONFIG_CMD_MEMORY md, mm, nm, mw, cp, cmp, crc, base,
598 loop, loopw, mtest
599 CONFIG_CMD_MISC Misc functions like sleep etc
600 CONFIG_CMD_MMC * MMC memory mapped support
601 CONFIG_CMD_MII * MII utility commands
602 CONFIG_CMD_NAND * NAND support
603 CONFIG_CMD_NET bootp, tftpboot, rarpboot
604 CONFIG_CMD_PCI * pciinfo
605 CONFIG_CMD_PCMCIA * PCMCIA support
606 CONFIG_CMD_PING * send ICMP ECHO_REQUEST to network
607 host
608 CONFIG_CMD_PORTIO * Port I/O
609 CONFIG_CMD_REGINFO * Register dump
610 CONFIG_CMD_RUN run command in env variable
611 CONFIG_CMD_SAVES * save S record dump
612 CONFIG_CMD_SCSI * SCSI Support
613 CONFIG_CMD_SDRAM * print SDRAM configuration information
614 (requires CONFIG_CMD_I2C)
615 CONFIG_CMD_SETGETDCR Support for DCR Register access
616 (4xx only)
617 CONFIG_CMD_SPI * SPI serial bus support
618 CONFIG_CMD_USB * USB support
619 CONFIG_CMD_VFD * VFD support (TRAB)
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500620 CONFIG_CMD_CDP * Cisco Discover Protocol support
621 CONFIG_CMD_FSL * Microblaze FSL support
wdenkc6097192002-11-03 00:24:07 +0000622
wdenkc6097192002-11-03 00:24:07 +0000623
624 EXAMPLE: If you want all functions except of network
625 support you can write:
626
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500627 #include "config_cmd_all.h"
628 #undef CONFIG_CMD_NET
wdenkc6097192002-11-03 00:24:07 +0000629
Gerald Van Baren213bf8c2007-03-31 12:23:51 -0400630 Other Commands:
631 fdt (flattened device tree) command: CONFIG_OF_LIBFDT
wdenkc6097192002-11-03 00:24:07 +0000632
633 Note: Don't enable the "icache" and "dcache" commands
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500634 (configuration option CONFIG_CMD_CACHE) unless you know
wdenk43d96162003-03-06 00:02:04 +0000635 what you (and your U-Boot users) are doing. Data
636 cache cannot be enabled on systems like the 8xx or
637 8260 (where accesses to the IMMR region must be
638 uncached), and it cannot be disabled on all other
639 systems where we (mis-) use the data cache to hold an
640 initial stack and some data.
wdenkc6097192002-11-03 00:24:07 +0000641
642
643 XXX - this list needs to get updated!
644
645- Watchdog:
646 CONFIG_WATCHDOG
647 If this variable is defined, it enables watchdog
wdenk7152b1d2003-09-05 23:19:14 +0000648 support. There must be support in the platform specific
wdenkc6097192002-11-03 00:24:07 +0000649 code for a watchdog. For the 8xx and 8260 CPUs, the
650 SIU Watchdog feature is enabled in the SYPCR
651 register.
652
stroesec1551ea2003-04-04 15:53:41 +0000653- U-Boot Version:
654 CONFIG_VERSION_VARIABLE
655 If this variable is defined, an environment variable
656 named "ver" is created by U-Boot showing the U-Boot
657 version as printed by the "version" command.
658 This variable is readonly.
659
wdenkc6097192002-11-03 00:24:07 +0000660- Real-Time Clock:
661
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500662 When CONFIG_CMD_DATE is selected, the type of the RTC
wdenkc6097192002-11-03 00:24:07 +0000663 has to be selected, too. Define exactly one of the
664 following options:
665
666 CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx
667 CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC
Guennadi Liakhovetski7ce63702008-04-15 14:15:30 +0200668 CONFIG_RTC_MC13783 - use MC13783 RTC
wdenkc6097192002-11-03 00:24:07 +0000669 CONFIG_RTC_MC146818 - use MC146818 RTC
wdenk1cb8e982003-03-06 21:55:29 +0000670 CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC
wdenkc6097192002-11-03 00:24:07 +0000671 CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC
wdenk7f70e852003-05-20 14:25:27 +0000672 CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC
wdenk3bac3512003-03-12 10:41:04 +0000673 CONFIG_RTC_DS164x - use Dallas DS164x RTC
Tor Krill9536dfc2008-03-15 15:40:26 +0100674 CONFIG_RTC_ISL1208 - use Intersil ISL1208 RTC
wdenk4c0d4c32004-06-09 17:34:58 +0000675 CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC
Joakim Tjernlundda8808d2008-03-26 13:02:13 +0100676 CFG_RTC_DS1337_NOOSC - Turn off the OSC output for DS1337
wdenkc6097192002-11-03 00:24:07 +0000677
wdenkb37c7e52003-06-30 16:24:52 +0000678 Note that if the RTC uses I2C, then the I2C interface
679 must also be configured. See I2C Support, below.
680
wdenkc6097192002-11-03 00:24:07 +0000681- Timestamp Support:
682
wdenk43d96162003-03-06 00:02:04 +0000683 When CONFIG_TIMESTAMP is selected, the timestamp
684 (date and time) of an image is printed by image
685 commands like bootm or iminfo. This option is
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500686 automatically enabled when you select CONFIG_CMD_DATE .
wdenkc6097192002-11-03 00:24:07 +0000687
688- Partition Support:
689 CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION
690 and/or CONFIG_ISO_PARTITION
691
Wolfgang Denk218ca722008-03-26 10:40:12 +0100692 If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
693 CONFIG_CMD_SCSI) you must configure support for at
694 least one partition type as well.
wdenkc6097192002-11-03 00:24:07 +0000695
696- IDE Reset method:
wdenk4d13cba2004-03-14 14:09:05 +0000697 CONFIG_IDE_RESET_ROUTINE - this is defined in several
698 board configurations files but used nowhere!
wdenkc6097192002-11-03 00:24:07 +0000699
wdenk4d13cba2004-03-14 14:09:05 +0000700 CONFIG_IDE_RESET - is this is defined, IDE Reset will
701 be performed by calling the function
702 ide_set_reset(int reset)
703 which has to be defined in a board specific file
wdenkc6097192002-11-03 00:24:07 +0000704
705- ATAPI Support:
706 CONFIG_ATAPI
707
708 Set this to enable ATAPI support.
709
wdenkc40b2952004-03-13 23:29:43 +0000710- LBA48 Support
711 CONFIG_LBA48
712
713 Set this to enable support for disks larger than 137GB
714 Also look at CFG_64BIT_LBA ,CFG_64BIT_VSPRINTF and CFG_64BIT_STRTOUL
715 Whithout these , LBA48 support uses 32bit variables and will 'only'
716 support disks up to 2.1TB.
717
718 CFG_64BIT_LBA:
719 When enabled, makes the IDE subsystem use 64bit sector addresses.
720 Default is 32bit.
721
wdenkc6097192002-11-03 00:24:07 +0000722- SCSI Support:
723 At the moment only there is only support for the
724 SYM53C8XX SCSI controller; define
725 CONFIG_SCSI_SYM53C8XX to enable it.
726
727 CFG_SCSI_MAX_LUN [8], CFG_SCSI_MAX_SCSI_ID [7] and
728 CFG_SCSI_MAX_DEVICE [CFG_SCSI_MAX_SCSI_ID *
729 CFG_SCSI_MAX_LUN] can be adjusted to define the
730 maximum numbers of LUNs, SCSI ID's and target
731 devices.
732 CFG_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
733
734- NETWORK Support (PCI):
wdenk682011f2003-06-03 23:54:09 +0000735 CONFIG_E1000
736 Support for Intel 8254x gigabit chips.
stroese53cf9432003-06-05 15:39:44 +0000737
Andre Schwarzac3315c2008-03-06 16:45:44 +0100738 CONFIG_E1000_FALLBACK_MAC
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200739 default MAC for empty EEPROM after production.
Andre Schwarzac3315c2008-03-06 16:45:44 +0100740
wdenkc6097192002-11-03 00:24:07 +0000741 CONFIG_EEPRO100
742 Support for Intel 82557/82559/82559ER chips.
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200743 Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
wdenkc6097192002-11-03 00:24:07 +0000744 write routine for first time initialisation.
745
746 CONFIG_TULIP
747 Support for Digital 2114x chips.
748 Optional CONFIG_TULIP_SELECT_MEDIA for board specific
749 modem chip initialisation (KS8761/QS6611).
750
751 CONFIG_NATSEMI
752 Support for National dp83815 chips.
753
754 CONFIG_NS8382X
755 Support for National dp8382[01] gigabit chips.
756
wdenk45219c42003-05-12 21:50:16 +0000757- NETWORK Support (other):
758
759 CONFIG_DRIVER_LAN91C96
760 Support for SMSC's LAN91C96 chips.
761
762 CONFIG_LAN91C96_BASE
763 Define this to hold the physical address
764 of the LAN91C96's I/O space
765
766 CONFIG_LAN91C96_USE_32_BIT
767 Define this to enable 32 bit addressing
768
wdenkf39748a2004-06-09 13:37:52 +0000769 CONFIG_DRIVER_SMC91111
770 Support for SMSC's LAN91C111 chip
771
772 CONFIG_SMC91111_BASE
773 Define this to hold the physical address
774 of the device (I/O space)
775
776 CONFIG_SMC_USE_32_BIT
777 Define this if data bus is 32 bits
778
779 CONFIG_SMC_USE_IOFUNCS
780 Define this to use i/o functions instead of macros
781 (some hardware wont work with macros)
782
Jens Gehrlein557b3772008-05-05 14:06:11 +0200783 CONFIG_DRIVER_SMC911X
784 Support for SMSC's LAN911x and LAN921x chips
785
786 CONFIG_DRIVER_SMC911X_BASE
787 Define this to hold the physical address
788 of the device (I/O space)
789
790 CONFIG_DRIVER_SMC911X_32_BIT
791 Define this if data bus is 32 bits
792
793 CONFIG_DRIVER_SMC911X_16_BIT
794 Define this if data bus is 16 bits. If your processor
795 automatically converts one 32 bit word to two 16 bit
796 words you may also try CONFIG_DRIVER_SMC911X_32_BIT.
797
wdenkc6097192002-11-03 00:24:07 +0000798- USB Support:
799 At the moment only the UHCI host controller is
wdenk4d13cba2004-03-14 14:09:05 +0000800 supported (PIP405, MIP405, MPC5200); define
wdenkc6097192002-11-03 00:24:07 +0000801 CONFIG_USB_UHCI to enable it.
802 define CONFIG_USB_KEYBOARD to enable the USB Keyboard
wdenk30d56fa2004-10-09 22:44:59 +0000803 and define CONFIG_USB_STORAGE to enable the USB
wdenkc6097192002-11-03 00:24:07 +0000804 storage devices.
805 Note:
806 Supported are USB Keyboards and USB Floppy drives
807 (TEAC FD-05PUB).
wdenk4d13cba2004-03-14 14:09:05 +0000808 MPC5200 USB requires additional defines:
809 CONFIG_USB_CLOCK
810 for 528 MHz Clock: 0x0001bbbb
811 CONFIG_USB_CONFIG
812 for differential drivers: 0x00001000
813 for single ended drivers: 0x00005000
Zhang Weifdcfaa12007-06-06 10:08:13 +0200814 CFG_USB_EVENT_POLL
815 May be defined to allow interrupt polling
816 instead of using asynchronous interrupts
wdenk4d13cba2004-03-14 14:09:05 +0000817
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200818- USB Device:
819 Define the below if you wish to use the USB console.
820 Once firmware is rebuilt from a serial console issue the
821 command "setenv stdin usbtty; setenv stdout usbtty" and
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200822 attach your USB cable. The Unix command "dmesg" should print
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200823 it has found a new device. The environment variable usbtty
824 can be set to gserial or cdc_acm to enable your device to
Wolfgang Denk386eda02006-06-14 18:14:56 +0200825 appear to a USB host as a Linux gserial device or a
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200826 Common Device Class Abstract Control Model serial device.
827 If you select usbtty = gserial you should be able to enumerate
828 a Linux host by
829 # modprobe usbserial vendor=0xVendorID product=0xProductID
830 else if using cdc_acm, simply setting the environment
831 variable usbtty to be cdc_acm should suffice. The following
832 might be defined in YourBoardName.h
Wolfgang Denk386eda02006-06-14 18:14:56 +0200833
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200834 CONFIG_USB_DEVICE
835 Define this to build a UDC device
wdenkc6097192002-11-03 00:24:07 +0000836
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200837 CONFIG_USB_TTY
838 Define this to have a tty type of device available to
839 talk to the UDC device
Wolfgang Denk386eda02006-06-14 18:14:56 +0200840
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200841 CFG_CONSOLE_IS_IN_ENV
842 Define this if you want stdin, stdout &/or stderr to
843 be set to usbtty.
844
845 mpc8xx:
846 CFG_USB_EXTC_CLK 0xBLAH
847 Derive USB clock from external clock "blah"
Wolfgang Denk386eda02006-06-14 18:14:56 +0200848 - CFG_USB_EXTC_CLK 0x02
849
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200850 CFG_USB_BRG_CLK 0xBLAH
851 Derive USB clock from brgclk
852 - CFG_USB_BRG_CLK 0x04
853
Wolfgang Denk386eda02006-06-14 18:14:56 +0200854 If you have a USB-IF assigned VendorID then you may wish to
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200855 define your own vendor specific values either in BoardName.h
Wolfgang Denk386eda02006-06-14 18:14:56 +0200856 or directly in usbd_vendor_info.h. If you don't define
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200857 CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
858 CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
859 should pretend to be a Linux device to it's target host.
860
861 CONFIG_USBD_MANUFACTURER
862 Define this string as the name of your company for
863 - CONFIG_USBD_MANUFACTURER "my company"
Wolfgang Denk386eda02006-06-14 18:14:56 +0200864
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200865 CONFIG_USBD_PRODUCT_NAME
866 Define this string as the name of your product
867 - CONFIG_USBD_PRODUCT_NAME "acme usb device"
868
869 CONFIG_USBD_VENDORID
870 Define this as your assigned Vendor ID from the USB
871 Implementors Forum. This *must* be a genuine Vendor ID
872 to avoid polluting the USB namespace.
873 - CONFIG_USBD_VENDORID 0xFFFF
Wolfgang Denk386eda02006-06-14 18:14:56 +0200874
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200875 CONFIG_USBD_PRODUCTID
876 Define this as the unique Product ID
877 for your device
878 - CONFIG_USBD_PRODUCTID 0xFFFF
wdenkc6097192002-11-03 00:24:07 +0000879
880
881- MMC Support:
882 The MMC controller on the Intel PXA is supported. To
883 enable this define CONFIG_MMC. The MMC can be
884 accessed from the boot prompt by mapping the device
885 to physical memory similar to flash. Command line is
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500886 enabled with CONFIG_CMD_MMC. The MMC driver also works with
887 the FAT fs. This is enabled with CONFIG_CMD_FAT.
wdenkc6097192002-11-03 00:24:07 +0000888
wdenk6705d812004-08-02 23:22:59 +0000889- Journaling Flash filesystem support:
890 CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
891 CONFIG_JFFS2_NAND_DEV
892 Define these for a default partition on a NAND device
893
894 CFG_JFFS2_FIRST_SECTOR,
895 CFG_JFFS2_FIRST_BANK, CFG_JFFS2_NUM_BANKS
896 Define these for a default partition on a NOR device
897
898 CFG_JFFS_CUSTOM_PART
899 Define this to create an own partition. You have to provide a
900 function struct part_info* jffs2_part_info(int part_num)
901
902 If you define only one JFFS2 partition you may also want to
wdenkefe2a4d2004-12-16 21:44:03 +0000903 #define CFG_JFFS_SINGLE_PART 1
wdenk6705d812004-08-02 23:22:59 +0000904 to disable the command chpart. This is the default when you
905 have not defined a custom partition
906
wdenkc6097192002-11-03 00:24:07 +0000907- Keyboard Support:
908 CONFIG_ISA_KEYBOARD
909
910 Define this to enable standard (PC-Style) keyboard
911 support
912
913 CONFIG_I8042_KBD
914 Standard PC keyboard driver with US (is default) and
915 GERMAN key layout (switch via environment 'keymap=de') support.
916 Export function i8042_kbd_init, i8042_tstc and i8042_getc
917 for cfb_console. Supports cursor blinking.
918
919- Video support:
920 CONFIG_VIDEO
921
922 Define this to enable video support (for output to
923 video).
924
925 CONFIG_VIDEO_CT69000
926
927 Enable Chips & Technologies 69000 Video chip
928
929 CONFIG_VIDEO_SMI_LYNXEM
wdenkb79a11c2004-03-25 15:14:43 +0000930 Enable Silicon Motion SMI 712/710/810 Video chip. The
wdenkeeb1b772004-03-23 22:53:55 +0000931 video output is selected via environment 'videoout'
932 (1 = LCD and 2 = CRT). If videoout is undefined, CRT is
933 assumed.
wdenkc6097192002-11-03 00:24:07 +0000934
wdenkb79a11c2004-03-25 15:14:43 +0000935 For the CT69000 and SMI_LYNXEM drivers, videomode is
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200936 selected via environment 'videomode'. Two different ways
wdenkeeb1b772004-03-23 22:53:55 +0000937 are possible:
938 - "videomode=num" 'num' is a standard LiLo mode numbers.
wdenk6e592382004-04-18 17:39:38 +0000939 Following standard modes are supported (* is default):
wdenkeeb1b772004-03-23 22:53:55 +0000940
941 Colors 640x480 800x600 1024x768 1152x864 1280x1024
942 -------------+---------------------------------------------
943 8 bits | 0x301* 0x303 0x305 0x161 0x307
944 15 bits | 0x310 0x313 0x316 0x162 0x319
945 16 bits | 0x311 0x314 0x317 0x163 0x31A
946 24 bits | 0x312 0x315 0x318 ? 0x31B
947 -------------+---------------------------------------------
wdenkc6097192002-11-03 00:24:07 +0000948 (i.e. setenv videomode 317; saveenv; reset;)
949
wdenkb79a11c2004-03-25 15:14:43 +0000950 - "videomode=bootargs" all the video parameters are parsed
Marcel Ziswiler7817cb22007-12-30 03:30:46 +0100951 from the bootargs. (See drivers/video/videomodes.c)
wdenkeeb1b772004-03-23 22:53:55 +0000952
953
stroesec1551ea2003-04-04 15:53:41 +0000954 CONFIG_VIDEO_SED13806
wdenk43d96162003-03-06 00:02:04 +0000955 Enable Epson SED13806 driver. This driver supports 8bpp
wdenka6c7ad22002-12-03 21:28:10 +0000956 and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
957 or CONFIG_VIDEO_SED13806_16BPP
958
wdenk682011f2003-06-03 23:54:09 +0000959- Keyboard Support:
wdenk8bde7f72003-06-27 21:31:46 +0000960 CONFIG_KEYBOARD
wdenk682011f2003-06-03 23:54:09 +0000961
wdenk8bde7f72003-06-27 21:31:46 +0000962 Define this to enable a custom keyboard support.
963 This simply calls drv_keyboard_init() which must be
964 defined in your board-specific files.
965 The only board using this so far is RBC823.
wdenka6c7ad22002-12-03 21:28:10 +0000966
wdenkc6097192002-11-03 00:24:07 +0000967- LCD Support: CONFIG_LCD
968
969 Define this to enable LCD support (for output to LCD
970 display); also select one of the supported displays
971 by defining one of these:
972
Stelian Pop39cf4802008-05-09 21:57:18 +0200973 CONFIG_ATMEL_LCD:
974
975 HITACHI TX09D70VM1CCA, 3.5", 240x320.
976
wdenkfd3103b2003-11-25 16:55:19 +0000977 CONFIG_NEC_NL6448AC33:
wdenkc6097192002-11-03 00:24:07 +0000978
wdenkfd3103b2003-11-25 16:55:19 +0000979 NEC NL6448AC33-18. Active, color, single scan.
wdenkc6097192002-11-03 00:24:07 +0000980
wdenkfd3103b2003-11-25 16:55:19 +0000981 CONFIG_NEC_NL6448BC20
wdenkc6097192002-11-03 00:24:07 +0000982
wdenkfd3103b2003-11-25 16:55:19 +0000983 NEC NL6448BC20-08. 6.5", 640x480.
984 Active, color, single scan.
985
986 CONFIG_NEC_NL6448BC33_54
987
988 NEC NL6448BC33-54. 10.4", 640x480.
wdenkc6097192002-11-03 00:24:07 +0000989 Active, color, single scan.
990
991 CONFIG_SHARP_16x9
992
993 Sharp 320x240. Active, color, single scan.
994 It isn't 16x9, and I am not sure what it is.
995
996 CONFIG_SHARP_LQ64D341
997
998 Sharp LQ64D341 display, 640x480.
999 Active, color, single scan.
1000
1001 CONFIG_HLD1045
1002
1003 HLD1045 display, 640x480.
1004 Active, color, single scan.
1005
1006 CONFIG_OPTREX_BW
1007
1008 Optrex CBL50840-2 NF-FW 99 22 M5
1009 or
1010 Hitachi LMG6912RPFC-00T
1011 or
1012 Hitachi SP14Q002
1013
1014 320x240. Black & white.
1015
1016 Normally display is black on white background; define
1017 CFG_WHITE_ON_BLACK to get it inverted.
1018
wdenk7152b1d2003-09-05 23:19:14 +00001019- Splash Screen Support: CONFIG_SPLASH_SCREEN
wdenkd791b1d2003-04-20 14:04:18 +00001020
wdenk8bde7f72003-06-27 21:31:46 +00001021 If this option is set, the environment is checked for
1022 a variable "splashimage". If found, the usual display
1023 of logo, copyright and system information on the LCD
wdenke94d2cd2004-06-30 22:59:18 +00001024 is suppressed and the BMP image at the address
wdenk8bde7f72003-06-27 21:31:46 +00001025 specified in "splashimage" is loaded instead. The
1026 console is redirected to the "nulldev", too. This
1027 allows for a "silent" boot where a splash screen is
1028 loaded very quickly after power-on.
wdenkd791b1d2003-04-20 14:04:18 +00001029
Stefan Roese98f4a3d2005-09-22 09:04:17 +02001030- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
1031
1032 If this option is set, additionally to standard BMP
1033 images, gzipped BMP images can be displayed via the
1034 splashscreen support or the bmp command.
1035
wdenkc29fdfc2003-08-29 20:57:53 +00001036- Compression support:
1037 CONFIG_BZIP2
1038
1039 If this option is set, support for bzip2 compressed
1040 images is included. If not, only uncompressed and gzip
1041 compressed images are supported.
1042
wdenk42d1f032003-10-15 23:53:47 +00001043 NOTE: the bzip2 algorithm requires a lot of RAM, so
1044 the malloc area (as defined by CFG_MALLOC_LEN) should
1045 be at least 4MB.
wdenkd791b1d2003-04-20 14:04:18 +00001046
wdenk17ea1172004-06-06 21:51:03 +00001047- MII/PHY support:
1048 CONFIG_PHY_ADDR
1049
1050 The address of PHY on MII bus.
1051
1052 CONFIG_PHY_CLOCK_FREQ (ppc4xx)
1053
1054 The clock frequency of the MII bus
1055
1056 CONFIG_PHY_GIGE
1057
1058 If this option is set, support for speed/duplex
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001059 detection of gigabit PHY is included.
wdenk17ea1172004-06-06 21:51:03 +00001060
1061 CONFIG_PHY_RESET_DELAY
1062
1063 Some PHY like Intel LXT971A need extra delay after
1064 reset before any MII register access is possible.
1065 For such PHY, set this option to the usec delay
1066 required. (minimum 300usec for LXT971A)
1067
1068 CONFIG_PHY_CMD_DELAY (ppc4xx)
1069
1070 Some PHY like Intel LXT971A need extra delay after
1071 command issued before MII status register can be read
1072
wdenkc6097192002-11-03 00:24:07 +00001073- Ethernet address:
1074 CONFIG_ETHADDR
1075 CONFIG_ETH2ADDR
1076 CONFIG_ETH3ADDR
1077
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001078 Define a default value for Ethernet address to use
1079 for the respective Ethernet interface, in case this
wdenkc6097192002-11-03 00:24:07 +00001080 is not determined automatically.
1081
1082- IP address:
1083 CONFIG_IPADDR
1084
1085 Define a default value for the IP address to use for
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001086 the default Ethernet interface, in case this is not
wdenkc6097192002-11-03 00:24:07 +00001087 determined through e.g. bootp.
1088
1089- Server IP address:
1090 CONFIG_SERVERIP
1091
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001092 Defines a default value for the IP address of a TFTP
wdenkc6097192002-11-03 00:24:07 +00001093 server to contact when using the "tftboot" command.
1094
David Updegraff53a5c422007-06-11 10:41:07 -05001095- Multicast TFTP Mode:
1096 CONFIG_MCAST_TFTP
1097
1098 Defines whether you want to support multicast TFTP as per
1099 rfc-2090; for example to work with atftp. Lets lots of targets
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001100 tftp down the same boot image concurrently. Note: the Ethernet
David Updegraff53a5c422007-06-11 10:41:07 -05001101 driver in use must provide a function: mcast() to join/leave a
1102 multicast group.
1103
1104 CONFIG_BOOTP_RANDOM_DELAY
wdenkc6097192002-11-03 00:24:07 +00001105- BOOTP Recovery Mode:
1106 CONFIG_BOOTP_RANDOM_DELAY
1107
1108 If you have many targets in a network that try to
1109 boot using BOOTP, you may want to avoid that all
1110 systems send out BOOTP requests at precisely the same
1111 moment (which would happen for instance at recovery
1112 from a power failure, when all systems will try to
1113 boot, thus flooding the BOOTP server. Defining
1114 CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
1115 inserted before sending out BOOTP requests. The
Wolfgang Denk6c33c782007-08-06 23:21:05 +02001116 following delays are inserted then:
wdenkc6097192002-11-03 00:24:07 +00001117
1118 1st BOOTP request: delay 0 ... 1 sec
1119 2nd BOOTP request: delay 0 ... 2 sec
1120 3rd BOOTP request: delay 0 ... 4 sec
1121 4th and following
1122 BOOTP requests: delay 0 ... 8 sec
1123
stroesefe389a82003-08-28 14:17:32 +00001124- DHCP Advanced Options:
Jon Loeliger1fe80d72007-07-09 22:08:34 -05001125 You can fine tune the DHCP functionality by defining
1126 CONFIG_BOOTP_* symbols:
stroesefe389a82003-08-28 14:17:32 +00001127
Jon Loeliger1fe80d72007-07-09 22:08:34 -05001128 CONFIG_BOOTP_SUBNETMASK
1129 CONFIG_BOOTP_GATEWAY
1130 CONFIG_BOOTP_HOSTNAME
1131 CONFIG_BOOTP_NISDOMAIN
1132 CONFIG_BOOTP_BOOTPATH
1133 CONFIG_BOOTP_BOOTFILESIZE
1134 CONFIG_BOOTP_DNS
1135 CONFIG_BOOTP_DNS2
1136 CONFIG_BOOTP_SEND_HOSTNAME
1137 CONFIG_BOOTP_NTPSERVER
1138 CONFIG_BOOTP_TIMEOFFSET
1139 CONFIG_BOOTP_VENDOREX
stroesefe389a82003-08-28 14:17:32 +00001140
Wilson Callan5d110f02007-07-28 10:56:13 -04001141 CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
1142 environment variable, not the BOOTP server.
stroesefe389a82003-08-28 14:17:32 +00001143
1144 CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
1145 serverip from a DHCP server, it is possible that more
1146 than one DNS serverip is offered to the client.
1147 If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
1148 serverip will be stored in the additional environment
1149 variable "dnsip2". The first DNS serverip is always
1150 stored in the variable "dnsip", when CONFIG_BOOTP_DNS
Jon Loeliger1fe80d72007-07-09 22:08:34 -05001151 is defined.
stroesefe389a82003-08-28 14:17:32 +00001152
1153 CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
1154 to do a dynamic update of a DNS server. To do this, they
1155 need the hostname of the DHCP requester.
Wilson Callan5d110f02007-07-28 10:56:13 -04001156 If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
Jon Loeliger1fe80d72007-07-09 22:08:34 -05001157 of the "hostname" environment variable is passed as
1158 option 12 to the DHCP server.
stroesefe389a82003-08-28 14:17:32 +00001159
Aras Vaichasd9a2f412008-03-26 09:43:57 +11001160 CONFIG_BOOTP_DHCP_REQUEST_DELAY
1161
1162 A 32bit value in microseconds for a delay between
1163 receiving a "DHCP Offer" and sending the "DHCP Request".
1164 This fixes a problem with certain DHCP servers that don't
1165 respond 100% of the time to a "DHCP request". E.g. On an
1166 AT91RM9200 processor running at 180MHz, this delay needed
1167 to be *at least* 15,000 usec before a Windows Server 2003
1168 DHCP server would reply 100% of the time. I recommend at
1169 least 50,000 usec to be safe. The alternative is to hope
1170 that one of the retries will be successful but note that
1171 the DHCP timeout and retry process takes a longer than
1172 this delay.
1173
wdenka3d991b2004-04-15 21:48:45 +00001174 - CDP Options:
wdenk6e592382004-04-18 17:39:38 +00001175 CONFIG_CDP_DEVICE_ID
wdenka3d991b2004-04-15 21:48:45 +00001176
1177 The device id used in CDP trigger frames.
1178
1179 CONFIG_CDP_DEVICE_ID_PREFIX
1180
1181 A two character string which is prefixed to the MAC address
1182 of the device.
1183
1184 CONFIG_CDP_PORT_ID
1185
1186 A printf format string which contains the ascii name of
1187 the port. Normally is set to "eth%d" which sets
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001188 eth0 for the first Ethernet, eth1 for the second etc.
wdenka3d991b2004-04-15 21:48:45 +00001189
1190 CONFIG_CDP_CAPABILITIES
1191
1192 A 32bit integer which indicates the device capabilities;
1193 0x00000010 for a normal host which does not forwards.
1194
1195 CONFIG_CDP_VERSION
1196
1197 An ascii string containing the version of the software.
1198
1199 CONFIG_CDP_PLATFORM
1200
1201 An ascii string containing the name of the platform.
1202
1203 CONFIG_CDP_TRIGGER
1204
1205 A 32bit integer sent on the trigger.
1206
1207 CONFIG_CDP_POWER_CONSUMPTION
1208
1209 A 16bit integer containing the power consumption of the
1210 device in .1 of milliwatts.
1211
1212 CONFIG_CDP_APPLIANCE_VLAN_TYPE
1213
1214 A byte containing the id of the VLAN.
1215
wdenkc6097192002-11-03 00:24:07 +00001216- Status LED: CONFIG_STATUS_LED
1217
1218 Several configurations allow to display the current
1219 status using a LED. For instance, the LED will blink
1220 fast while running U-Boot code, stop blinking as
1221 soon as a reply to a BOOTP request was received, and
1222 start blinking slow once the Linux kernel is running
1223 (supported by a status LED driver in the Linux
1224 kernel). Defining CONFIG_STATUS_LED enables this
1225 feature in U-Boot.
1226
1227- CAN Support: CONFIG_CAN_DRIVER
1228
1229 Defining CONFIG_CAN_DRIVER enables CAN driver support
1230 on those systems that support this (optional)
1231 feature, like the TQM8xxL modules.
1232
1233- I2C Support: CONFIG_HARD_I2C | CONFIG_SOFT_I2C
1234
wdenkb37c7e52003-06-30 16:24:52 +00001235 These enable I2C serial bus commands. Defining either of
wdenk945af8d2003-07-16 21:53:01 +00001236 (but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001237 include the appropriate I2C driver for the selected CPU.
wdenkc6097192002-11-03 00:24:07 +00001238
wdenk945af8d2003-07-16 21:53:01 +00001239 This will allow you to use i2c commands at the u-boot
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001240 command line (as long as you set CONFIG_CMD_I2C in
wdenkb37c7e52003-06-30 16:24:52 +00001241 CONFIG_COMMANDS) and communicate with i2c based realtime
1242 clock chips. See common/cmd_i2c.c for a description of the
wdenk43d96162003-03-06 00:02:04 +00001243 command line interface.
wdenkc6097192002-11-03 00:24:07 +00001244
Ben Warrenbb99ad62006-09-07 16:50:54 -04001245 CONFIG_I2C_CMD_TREE is a recommended option that places
1246 all I2C commands under a single 'i2c' root command. The
1247 older 'imm', 'imd', 'iprobe' etc. commands are considered
1248 deprecated and may disappear in the future.
1249
1250 CONFIG_HARD_I2C selects a hardware I2C controller.
wdenkc6097192002-11-03 00:24:07 +00001251
wdenk945af8d2003-07-16 21:53:01 +00001252 CONFIG_SOFT_I2C configures u-boot to use a software (aka
wdenkb37c7e52003-06-30 16:24:52 +00001253 bit-banging) driver instead of CPM or similar hardware
1254 support for I2C.
wdenkc6097192002-11-03 00:24:07 +00001255
wdenk945af8d2003-07-16 21:53:01 +00001256 There are several other quantities that must also be
wdenkb37c7e52003-06-30 16:24:52 +00001257 defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C.
wdenkc6097192002-11-03 00:24:07 +00001258
wdenkb37c7e52003-06-30 16:24:52 +00001259 In both cases you will need to define CFG_I2C_SPEED
wdenk945af8d2003-07-16 21:53:01 +00001260 to be the frequency (in Hz) at which you wish your i2c bus
1261 to run and CFG_I2C_SLAVE to be the address of this node (ie
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001262 the CPU's i2c node address).
wdenk945af8d2003-07-16 21:53:01 +00001263
wdenkb37c7e52003-06-30 16:24:52 +00001264 Now, the u-boot i2c code for the mpc8xx (cpu/mpc8xx/i2c.c)
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001265 sets the CPU up as a master node and so its address should
wdenkb37c7e52003-06-30 16:24:52 +00001266 therefore be cleared to 0 (See, eg, MPC823e User's Manual
wdenk945af8d2003-07-16 21:53:01 +00001267 p.16-473). So, set CFG_I2C_SLAVE to 0.
wdenkc6097192002-11-03 00:24:07 +00001268
wdenk945af8d2003-07-16 21:53:01 +00001269 That's all that's required for CONFIG_HARD_I2C.
wdenkb37c7e52003-06-30 16:24:52 +00001270
1271 If you use the software i2c interface (CONFIG_SOFT_I2C)
1272 then the following macros need to be defined (examples are
1273 from include/configs/lwmon.h):
wdenkc6097192002-11-03 00:24:07 +00001274
1275 I2C_INIT
1276
wdenkb37c7e52003-06-30 16:24:52 +00001277 (Optional). Any commands necessary to enable the I2C
wdenk43d96162003-03-06 00:02:04 +00001278 controller or configure ports.
wdenkc6097192002-11-03 00:24:07 +00001279
wdenkba56f622004-02-06 23:19:44 +00001280 eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL)
wdenkb37c7e52003-06-30 16:24:52 +00001281
wdenkc6097192002-11-03 00:24:07 +00001282 I2C_PORT
1283
wdenk43d96162003-03-06 00:02:04 +00001284 (Only for MPC8260 CPU). The I/O port to use (the code
1285 assumes both bits are on the same port). Valid values
1286 are 0..3 for ports A..D.
wdenkc6097192002-11-03 00:24:07 +00001287
1288 I2C_ACTIVE
1289
1290 The code necessary to make the I2C data line active
1291 (driven). If the data line is open collector, this
1292 define can be null.
1293
wdenkb37c7e52003-06-30 16:24:52 +00001294 eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA)
1295
wdenkc6097192002-11-03 00:24:07 +00001296 I2C_TRISTATE
1297
1298 The code necessary to make the I2C data line tri-stated
1299 (inactive). If the data line is open collector, this
1300 define can be null.
1301
wdenkb37c7e52003-06-30 16:24:52 +00001302 eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
1303
wdenkc6097192002-11-03 00:24:07 +00001304 I2C_READ
1305
1306 Code that returns TRUE if the I2C data line is high,
1307 FALSE if it is low.
1308
wdenkb37c7e52003-06-30 16:24:52 +00001309 eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
1310
wdenkc6097192002-11-03 00:24:07 +00001311 I2C_SDA(bit)
1312
1313 If <bit> is TRUE, sets the I2C data line high. If it
1314 is FALSE, it clears it (low).
1315
wdenkb37c7e52003-06-30 16:24:52 +00001316 eg: #define I2C_SDA(bit) \
wdenk2535d602003-07-17 23:16:40 +00001317 if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \
wdenkba56f622004-02-06 23:19:44 +00001318 else immr->im_cpm.cp_pbdat &= ~PB_SDA
wdenkb37c7e52003-06-30 16:24:52 +00001319
wdenkc6097192002-11-03 00:24:07 +00001320 I2C_SCL(bit)
1321
1322 If <bit> is TRUE, sets the I2C clock line high. If it
1323 is FALSE, it clears it (low).
1324
wdenkb37c7e52003-06-30 16:24:52 +00001325 eg: #define I2C_SCL(bit) \
wdenk2535d602003-07-17 23:16:40 +00001326 if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \
wdenkba56f622004-02-06 23:19:44 +00001327 else immr->im_cpm.cp_pbdat &= ~PB_SCL
wdenkb37c7e52003-06-30 16:24:52 +00001328
wdenkc6097192002-11-03 00:24:07 +00001329 I2C_DELAY
1330
1331 This delay is invoked four times per clock cycle so this
1332 controls the rate of data transfer. The data rate thus
wdenkb37c7e52003-06-30 16:24:52 +00001333 is 1 / (I2C_DELAY * 4). Often defined to be something
wdenk945af8d2003-07-16 21:53:01 +00001334 like:
1335
wdenkb37c7e52003-06-30 16:24:52 +00001336 #define I2C_DELAY udelay(2)
wdenkc6097192002-11-03 00:24:07 +00001337
wdenk47cd00f2003-03-06 13:39:27 +00001338 CFG_I2C_INIT_BOARD
1339
wdenk8bde7f72003-06-27 21:31:46 +00001340 When a board is reset during an i2c bus transfer
1341 chips might think that the current transfer is still
1342 in progress. On some boards it is possible to access
1343 the i2c SCLK line directly, either by using the
1344 processor pin as a GPIO or by having a second pin
1345 connected to the bus. If this option is defined a
1346 custom i2c_init_board() routine in boards/xxx/board.c
1347 is run early in the boot sequence.
wdenk47cd00f2003-03-06 13:39:27 +00001348
wdenk17ea1172004-06-06 21:51:03 +00001349 CONFIG_I2CFAST (PPC405GP|PPC405EP only)
1350
1351 This option enables configuration of bi_iic_fast[] flags
1352 in u-boot bd_info structure based on u-boot environment
1353 variable "i2cfast". (see also i2cfast)
1354
Ben Warrenbb99ad62006-09-07 16:50:54 -04001355 CONFIG_I2C_MULTI_BUS
1356
1357 This option allows the use of multiple I2C buses, each of which
1358 must have a controller. At any point in time, only one bus is
1359 active. To switch to a different bus, use the 'i2c dev' command.
1360 Note that bus numbering is zero-based.
1361
1362 CFG_I2C_NOPROBES
1363
1364 This option specifies a list of I2C devices that will be skipped
1365 when the 'i2c probe' command is issued (or 'iprobe' using the legacy
1366 command). If CONFIG_I2C_MULTI_BUS is set, specify a list of bus-device
Wolfgang Denk218ca722008-03-26 10:40:12 +01001367 pairs. Otherwise, specify a 1D array of device addresses
Ben Warrenbb99ad62006-09-07 16:50:54 -04001368
1369 e.g.
1370 #undef CONFIG_I2C_MULTI_BUS
1371 #define CFG_I2C_NOPROBES {0x50,0x68}
1372
1373 will skip addresses 0x50 and 0x68 on a board with one I2C bus
1374
1375 #define CONFIG_I2C_MULTI_BUS
1376 #define CFG_I2C_MULTI_NOPROBES {{0,0x50},{0,0x68},{1,0x54}}
1377
1378 will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
1379
Timur Tabibe5e61812006-11-03 19:15:00 -06001380 CFG_SPD_BUS_NUM
1381
1382 If defined, then this indicates the I2C bus number for DDR SPD.
1383 If not defined, then U-Boot assumes that SPD is on I2C bus 0.
1384
Stefan Roese0dc018e2007-02-20 10:51:26 +01001385 CFG_RTC_BUS_NUM
1386
1387 If defined, then this indicates the I2C bus number for the RTC.
1388 If not defined, then U-Boot assumes that RTC is on I2C bus 0.
1389
1390 CFG_DTT_BUS_NUM
1391
1392 If defined, then this indicates the I2C bus number for the DTT.
1393 If not defined, then U-Boot assumes that DTT is on I2C bus 0.
1394
Timur Tabibe5e61812006-11-03 19:15:00 -06001395 CONFIG_FSL_I2C
1396
1397 Define this option if you want to use Freescale's I2C driver in
Marcel Ziswiler7817cb22007-12-30 03:30:46 +01001398 drivers/i2c/fsl_i2c.c.
Timur Tabibe5e61812006-11-03 19:15:00 -06001399
1400
wdenkc6097192002-11-03 00:24:07 +00001401- SPI Support: CONFIG_SPI
1402
1403 Enables SPI driver (so far only tested with
1404 SPI EEPROM, also an instance works with Crystal A/D and
1405 D/As on the SACSng board)
1406
1407 CONFIG_SPI_X
1408
1409 Enables extended (16-bit) SPI EEPROM addressing.
1410 (symmetrical to CONFIG_I2C_X)
1411
1412 CONFIG_SOFT_SPI
1413
wdenk43d96162003-03-06 00:02:04 +00001414 Enables a software (bit-bang) SPI driver rather than
1415 using hardware support. This is a general purpose
1416 driver that only requires three general I/O port pins
1417 (two outputs, one input) to function. If this is
1418 defined, the board configuration must define several
1419 SPI configuration items (port pins to use, etc). For
1420 an example, see include/configs/sacsng.h.
wdenkc6097192002-11-03 00:24:07 +00001421
Ben Warren04a9e112008-01-16 22:37:35 -05001422 CONFIG_HARD_SPI
1423
1424 Enables a hardware SPI driver for general-purpose reads
1425 and writes. As with CONFIG_SOFT_SPI, the board configuration
1426 must define a list of chip-select function pointers.
1427 Currently supported on some MPC8xxx processors. For an
1428 example, see include/configs/mpc8349emds.h.
1429
Guennadi Liakhovetski38254f42008-04-15 14:14:25 +02001430 CONFIG_MXC_SPI
1431
1432 Enables the driver for the SPI controllers on i.MX and MXC
1433 SoCs. Currently only i.MX31 is supported.
1434
Matthias Fuchs01335022007-12-27 17:12:34 +01001435- FPGA Support: CONFIG_FPGA
1436
1437 Enables FPGA subsystem.
1438
1439 CONFIG_FPGA_<vendor>
1440
1441 Enables support for specific chip vendors.
1442 (ALTERA, XILINX)
1443
1444 CONFIG_FPGA_<family>
1445
1446 Enables support for FPGA family.
1447 (SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
1448
1449 CONFIG_FPGA_COUNT
wdenkc6097192002-11-03 00:24:07 +00001450
wdenk43d96162003-03-06 00:02:04 +00001451 Specify the number of FPGA devices to support.
wdenkc6097192002-11-03 00:24:07 +00001452
wdenk8bde7f72003-06-27 21:31:46 +00001453 CFG_FPGA_PROG_FEEDBACK
wdenkc6097192002-11-03 00:24:07 +00001454
wdenk8bde7f72003-06-27 21:31:46 +00001455 Enable printing of hash marks during FPGA configuration.
wdenkc6097192002-11-03 00:24:07 +00001456
1457 CFG_FPGA_CHECK_BUSY
1458
wdenk43d96162003-03-06 00:02:04 +00001459 Enable checks on FPGA configuration interface busy
1460 status by the configuration function. This option
1461 will require a board or device specific function to
1462 be written.
wdenkc6097192002-11-03 00:24:07 +00001463
1464 CONFIG_FPGA_DELAY
1465
1466 If defined, a function that provides delays in the FPGA
1467 configuration driver.
1468
1469 CFG_FPGA_CHECK_CTRLC
1470 Allow Control-C to interrupt FPGA configuration
1471
1472 CFG_FPGA_CHECK_ERROR
1473
wdenk43d96162003-03-06 00:02:04 +00001474 Check for configuration errors during FPGA bitfile
1475 loading. For example, abort during Virtex II
1476 configuration if the INIT_B line goes low (which
1477 indicated a CRC error).
wdenkc6097192002-11-03 00:24:07 +00001478
1479 CFG_FPGA_WAIT_INIT
1480
wdenk43d96162003-03-06 00:02:04 +00001481 Maximum time to wait for the INIT_B line to deassert
1482 after PROB_B has been deasserted during a Virtex II
1483 FPGA configuration sequence. The default time is 500
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001484 ms.
wdenkc6097192002-11-03 00:24:07 +00001485
1486 CFG_FPGA_WAIT_BUSY
1487
wdenk43d96162003-03-06 00:02:04 +00001488 Maximum time to wait for BUSY to deassert during
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001489 Virtex II FPGA configuration. The default is 5 ms.
wdenkc6097192002-11-03 00:24:07 +00001490
1491 CFG_FPGA_WAIT_CONFIG
1492
wdenk43d96162003-03-06 00:02:04 +00001493 Time to wait after FPGA configuration. The default is
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001494 200 ms.
wdenkc6097192002-11-03 00:24:07 +00001495
1496- Configuration Management:
1497 CONFIG_IDENT_STRING
1498
wdenk43d96162003-03-06 00:02:04 +00001499 If defined, this string will be added to the U-Boot
1500 version information (U_BOOT_VERSION)
wdenkc6097192002-11-03 00:24:07 +00001501
1502- Vendor Parameter Protection:
1503
wdenk43d96162003-03-06 00:02:04 +00001504 U-Boot considers the values of the environment
1505 variables "serial#" (Board Serial Number) and
wdenk7152b1d2003-09-05 23:19:14 +00001506 "ethaddr" (Ethernet Address) to be parameters that
wdenk43d96162003-03-06 00:02:04 +00001507 are set once by the board vendor / manufacturer, and
1508 protects these variables from casual modification by
1509 the user. Once set, these variables are read-only,
1510 and write or delete attempts are rejected. You can
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001511 change this behaviour:
wdenkc6097192002-11-03 00:24:07 +00001512
1513 If CONFIG_ENV_OVERWRITE is #defined in your config
1514 file, the write protection for vendor parameters is
wdenk47cd00f2003-03-06 13:39:27 +00001515 completely disabled. Anybody can change or delete
wdenkc6097192002-11-03 00:24:07 +00001516 these parameters.
1517
1518 Alternatively, if you #define _both_ CONFIG_ETHADDR
1519 _and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001520 Ethernet address is installed in the environment,
wdenkc6097192002-11-03 00:24:07 +00001521 which can be changed exactly ONCE by the user. [The
1522 serial# is unaffected by this, i. e. it remains
1523 read-only.]
1524
1525- Protected RAM:
1526 CONFIG_PRAM
1527
1528 Define this variable to enable the reservation of
1529 "protected RAM", i. e. RAM which is not overwritten
1530 by U-Boot. Define CONFIG_PRAM to hold the number of
1531 kB you want to reserve for pRAM. You can overwrite
1532 this default value by defining an environment
1533 variable "pram" to the number of kB you want to
1534 reserve. Note that the board info structure will
1535 still show the full amount of RAM. If pRAM is
1536 reserved, a new environment variable "mem" will
1537 automatically be defined to hold the amount of
1538 remaining RAM in a form that can be passed as boot
1539 argument to Linux, for instance like that:
1540
Wolfgang Denkfe126d82005-11-20 21:40:11 +01001541 setenv bootargs ... mem=\${mem}
wdenkc6097192002-11-03 00:24:07 +00001542 saveenv
1543
1544 This way you can tell Linux not to use this memory,
1545 either, which results in a memory region that will
1546 not be affected by reboots.
1547
1548 *WARNING* If your board configuration uses automatic
1549 detection of the RAM size, you must make sure that
1550 this memory test is non-destructive. So far, the
1551 following board configurations are known to be
1552 "pRAM-clean":
1553
1554 ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL,
1555 HERMES, IP860, RPXlite, LWMON, LANTEC,
1556 PCU_E, FLAGADM, TQM8260
1557
1558- Error Recovery:
1559 CONFIG_PANIC_HANG
1560
1561 Define this variable to stop the system in case of a
1562 fatal error, so that you have to reset it manually.
1563 This is probably NOT a good idea for an embedded
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001564 system where you want the system to reboot
wdenkc6097192002-11-03 00:24:07 +00001565 automatically as fast as possible, but it may be
1566 useful during development since you can try to debug
1567 the conditions that lead to the situation.
1568
1569 CONFIG_NET_RETRY_COUNT
1570
wdenk43d96162003-03-06 00:02:04 +00001571 This variable defines the number of retries for
1572 network operations like ARP, RARP, TFTP, or BOOTP
1573 before giving up the operation. If not defined, a
1574 default value of 5 is used.
wdenkc6097192002-11-03 00:24:07 +00001575
Guennadi Liakhovetski40cb90e2008-04-03 17:04:19 +02001576 CONFIG_ARP_TIMEOUT
1577
1578 Timeout waiting for an ARP reply in milliseconds.
1579
wdenkc6097192002-11-03 00:24:07 +00001580- Command Interpreter:
Wolfgang Denk8078f1a2006-10-28 02:28:02 +02001581 CONFIG_AUTO_COMPLETE
wdenk04a85b32004-04-15 18:22:41 +00001582
1583 Enable auto completion of commands using TAB.
1584
Wolfgang Denka9398e02006-11-27 15:32:42 +01001585 Note that this feature has NOT been implemented yet
1586 for the "hush" shell.
Wolfgang Denk8078f1a2006-10-28 02:28:02 +02001587
1588
wdenkc6097192002-11-03 00:24:07 +00001589 CFG_HUSH_PARSER
1590
1591 Define this variable to enable the "hush" shell (from
1592 Busybox) as command line interpreter, thus enabling
1593 powerful command line syntax like
1594 if...then...else...fi conditionals or `&&' and '||'
1595 constructs ("shell scripts").
1596
1597 If undefined, you get the old, much simpler behaviour
1598 with a somewhat smaller memory footprint.
1599
1600
1601 CFG_PROMPT_HUSH_PS2
1602
1603 This defines the secondary prompt string, which is
1604 printed when the command interpreter needs more input
1605 to complete a command. Usually "> ".
1606
1607 Note:
1608
wdenk8bde7f72003-06-27 21:31:46 +00001609 In the current implementation, the local variables
1610 space and global environment variables space are
1611 separated. Local variables are those you define by
1612 simply typing `name=value'. To access a local
1613 variable later on, you have write `$name' or
1614 `${name}'; to execute the contents of a variable
1615 directly type `$name' at the command prompt.
wdenkc6097192002-11-03 00:24:07 +00001616
wdenk43d96162003-03-06 00:02:04 +00001617 Global environment variables are those you use
1618 setenv/printenv to work with. To run a command stored
1619 in such a variable, you need to use the run command,
1620 and you must not use the '$' sign to access them.
wdenkc6097192002-11-03 00:24:07 +00001621
1622 To store commands and special characters in a
1623 variable, please use double quotation marks
1624 surrounding the whole text of the variable, instead
1625 of the backslashes before semicolons and special
1626 symbols.
1627
Wolfgang Denkaa0c71a2006-07-21 11:35:21 +02001628- Commandline Editing and History:
1629 CONFIG_CMDLINE_EDITING
1630
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001631 Enable editing and History functions for interactive
Wolfgang Denkb9365a22006-07-21 11:56:05 +02001632 commandline input operations
Wolfgang Denkaa0c71a2006-07-21 11:35:21 +02001633
wdenka8c7c702003-12-06 19:49:23 +00001634- Default Environment:
wdenkc6097192002-11-03 00:24:07 +00001635 CONFIG_EXTRA_ENV_SETTINGS
1636
wdenk43d96162003-03-06 00:02:04 +00001637 Define this to contain any number of null terminated
1638 strings (variable = value pairs) that will be part of
wdenk7152b1d2003-09-05 23:19:14 +00001639 the default environment compiled into the boot image.
wdenk2262cfe2002-11-18 00:14:45 +00001640
wdenk43d96162003-03-06 00:02:04 +00001641 For example, place something like this in your
1642 board's config file:
wdenkc6097192002-11-03 00:24:07 +00001643
1644 #define CONFIG_EXTRA_ENV_SETTINGS \
1645 "myvar1=value1\0" \
1646 "myvar2=value2\0"
1647
wdenk43d96162003-03-06 00:02:04 +00001648 Warning: This method is based on knowledge about the
1649 internal format how the environment is stored by the
1650 U-Boot code. This is NOT an official, exported
1651 interface! Although it is unlikely that this format
wdenk7152b1d2003-09-05 23:19:14 +00001652 will change soon, there is no guarantee either.
wdenkc6097192002-11-03 00:24:07 +00001653 You better know what you are doing here.
1654
wdenk43d96162003-03-06 00:02:04 +00001655 Note: overly (ab)use of the default environment is
1656 discouraged. Make sure to check other ways to preset
1657 the environment like the autoscript function or the
1658 boot command first.
wdenkc6097192002-11-03 00:24:07 +00001659
wdenka8c7c702003-12-06 19:49:23 +00001660- DataFlash Support:
wdenk2abbe072003-06-16 23:50:08 +00001661 CONFIG_HAS_DATAFLASH
1662
wdenk8bde7f72003-06-27 21:31:46 +00001663 Defining this option enables DataFlash features and
1664 allows to read/write in Dataflash via the standard
1665 commands cp, md...
wdenk2abbe072003-06-16 23:50:08 +00001666
wdenk3f85ce22004-02-23 16:11:30 +00001667- SystemACE Support:
1668 CONFIG_SYSTEMACE
1669
1670 Adding this option adds support for Xilinx SystemACE
1671 chips attached via some sort of local bus. The address
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001672 of the chip must also be defined in the
wdenk3f85ce22004-02-23 16:11:30 +00001673 CFG_SYSTEMACE_BASE macro. For example:
1674
1675 #define CONFIG_SYSTEMACE
1676 #define CFG_SYSTEMACE_BASE 0xf0000000
1677
1678 When SystemACE support is added, the "ace" device type
1679 becomes available to the fat commands, i.e. fatls.
1680
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02001681- TFTP Fixed UDP Port:
1682 CONFIG_TFTP_PORT
1683
Wolfgang Denk28cb9372005-09-24 23:25:46 +02001684 If this is defined, the environment variable tftpsrcp
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02001685 is used to supply the TFTP UDP source port value.
Wolfgang Denk28cb9372005-09-24 23:25:46 +02001686 If tftpsrcp isn't defined, the normal pseudo-random port
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02001687 number generator is used.
1688
Wolfgang Denk28cb9372005-09-24 23:25:46 +02001689 Also, the environment variable tftpdstp is used to supply
1690 the TFTP UDP destination port value. If tftpdstp isn't
1691 defined, the normal port 69 is used.
1692
1693 The purpose for tftpsrcp is to allow a TFTP server to
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02001694 blindly start the TFTP transfer using the pre-configured
1695 target IP address and UDP port. This has the effect of
1696 "punching through" the (Windows XP) firewall, allowing
1697 the remainder of the TFTP transfer to proceed normally.
1698 A better solution is to properly configure the firewall,
1699 but sometimes that is not allowed.
1700
wdenka8c7c702003-12-06 19:49:23 +00001701- Show boot progress:
wdenkc6097192002-11-03 00:24:07 +00001702 CONFIG_SHOW_BOOT_PROGRESS
1703
wdenk43d96162003-03-06 00:02:04 +00001704 Defining this option allows to add some board-
1705 specific code (calling a user-provided function
1706 "show_boot_progress(int)") that enables you to show
1707 the system's boot progress on some display (for
1708 example, some LED's) on your board. At the moment,
1709 the following checkpoints are implemented:
wdenkc6097192002-11-03 00:24:07 +00001710
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001711Legacy uImage format:
1712
wdenkc6097192002-11-03 00:24:07 +00001713 Arg Where When
1714 1 common/cmd_bootm.c before attempting to boot an image
wdenkba56f622004-02-06 23:19:44 +00001715 -1 common/cmd_bootm.c Image header has bad magic number
wdenkc6097192002-11-03 00:24:07 +00001716 2 common/cmd_bootm.c Image header has correct magic number
wdenkba56f622004-02-06 23:19:44 +00001717 -2 common/cmd_bootm.c Image header has bad checksum
wdenkc6097192002-11-03 00:24:07 +00001718 3 common/cmd_bootm.c Image header has correct checksum
wdenkba56f622004-02-06 23:19:44 +00001719 -3 common/cmd_bootm.c Image data has bad checksum
wdenkc6097192002-11-03 00:24:07 +00001720 4 common/cmd_bootm.c Image data has correct checksum
1721 -4 common/cmd_bootm.c Image is for unsupported architecture
1722 5 common/cmd_bootm.c Architecture check OK
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001723 -5 common/cmd_bootm.c Wrong Image Type (not kernel, multi)
wdenkc6097192002-11-03 00:24:07 +00001724 6 common/cmd_bootm.c Image Type check OK
1725 -6 common/cmd_bootm.c gunzip uncompression error
1726 -7 common/cmd_bootm.c Unimplemented compression type
1727 7 common/cmd_bootm.c Uncompression OK
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001728 8 common/cmd_bootm.c No uncompress/copy overwrite error
wdenkc6097192002-11-03 00:24:07 +00001729 -9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX)
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001730
1731 9 common/image.c Start initial ramdisk verification
1732 -10 common/image.c Ramdisk header has bad magic number
1733 -11 common/image.c Ramdisk header has bad checksum
1734 10 common/image.c Ramdisk header is OK
1735 -12 common/image.c Ramdisk data has bad checksum
1736 11 common/image.c Ramdisk data has correct checksum
1737 12 common/image.c Ramdisk verification complete, start loading
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001738 -13 common/image.c Wrong Image Type (not PPC Linux ramdisk)
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001739 13 common/image.c Start multifile image verification
1740 14 common/image.c No initial ramdisk, no multifile, continue.
1741
1742 15 lib_<arch>/bootm.c All preparation done, transferring control to OS
wdenkc6097192002-11-03 00:24:07 +00001743
wdenk11dadd52004-02-27 00:07:27 +00001744 -30 lib_ppc/board.c Fatal error, hang the system
1745 -31 post/post.c POST test failed, detected by post_output_backlog()
1746 -32 post/post.c POST test failed, detected by post_run_single()
wdenk63e73c92004-02-23 22:22:28 +00001747
Heiko Schocher566a4942007-06-22 19:11:54 +02001748 34 common/cmd_doc.c before loading a Image from a DOC device
1749 -35 common/cmd_doc.c Bad usage of "doc" command
1750 35 common/cmd_doc.c correct usage of "doc" command
1751 -36 common/cmd_doc.c No boot device
1752 36 common/cmd_doc.c correct boot device
1753 -37 common/cmd_doc.c Unknown Chip ID on boot device
1754 37 common/cmd_doc.c correct chip ID found, device available
1755 -38 common/cmd_doc.c Read Error on boot device
1756 38 common/cmd_doc.c reading Image header from DOC device OK
1757 -39 common/cmd_doc.c Image header has bad magic number
1758 39 common/cmd_doc.c Image header has correct magic number
1759 -40 common/cmd_doc.c Error reading Image from DOC device
1760 40 common/cmd_doc.c Image header has correct magic number
1761 41 common/cmd_ide.c before loading a Image from a IDE device
1762 -42 common/cmd_ide.c Bad usage of "ide" command
1763 42 common/cmd_ide.c correct usage of "ide" command
1764 -43 common/cmd_ide.c No boot device
1765 43 common/cmd_ide.c boot device found
1766 -44 common/cmd_ide.c Device not available
1767 44 common/cmd_ide.c Device available
1768 -45 common/cmd_ide.c wrong partition selected
1769 45 common/cmd_ide.c partition selected
1770 -46 common/cmd_ide.c Unknown partition table
1771 46 common/cmd_ide.c valid partition table found
1772 -47 common/cmd_ide.c Invalid partition type
1773 47 common/cmd_ide.c correct partition type
1774 -48 common/cmd_ide.c Error reading Image Header on boot device
1775 48 common/cmd_ide.c reading Image Header from IDE device OK
1776 -49 common/cmd_ide.c Image header has bad magic number
1777 49 common/cmd_ide.c Image header has correct magic number
1778 -50 common/cmd_ide.c Image header has bad checksum
1779 50 common/cmd_ide.c Image header has correct checksum
1780 -51 common/cmd_ide.c Error reading Image from IDE device
1781 51 common/cmd_ide.c reading Image from IDE device OK
1782 52 common/cmd_nand.c before loading a Image from a NAND device
1783 -53 common/cmd_nand.c Bad usage of "nand" command
1784 53 common/cmd_nand.c correct usage of "nand" command
1785 -54 common/cmd_nand.c No boot device
1786 54 common/cmd_nand.c boot device found
1787 -55 common/cmd_nand.c Unknown Chip ID on boot device
1788 55 common/cmd_nand.c correct chip ID found, device available
1789 -56 common/cmd_nand.c Error reading Image Header on boot device
1790 56 common/cmd_nand.c reading Image Header from NAND device OK
1791 -57 common/cmd_nand.c Image header has bad magic number
1792 57 common/cmd_nand.c Image header has correct magic number
1793 -58 common/cmd_nand.c Error reading Image from NAND device
1794 58 common/cmd_nand.c reading Image from NAND device OK
wdenkc6097192002-11-03 00:24:07 +00001795
Heiko Schocher566a4942007-06-22 19:11:54 +02001796 -60 common/env_common.c Environment has a bad CRC, using default
wdenkc6097192002-11-03 00:24:07 +00001797
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001798 64 net/eth.c starting with Ethernet configuration.
Heiko Schocher566a4942007-06-22 19:11:54 +02001799 -64 net/eth.c no Ethernet found.
1800 65 net/eth.c Ethernet found.
wdenk206c60c2003-09-18 10:02:25 +00001801
Heiko Schocher566a4942007-06-22 19:11:54 +02001802 -80 common/cmd_net.c usage wrong
1803 80 common/cmd_net.c before calling NetLoop()
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001804 -81 common/cmd_net.c some error in NetLoop() occurred
Heiko Schocher566a4942007-06-22 19:11:54 +02001805 81 common/cmd_net.c NetLoop() back without error
1806 -82 common/cmd_net.c size == 0 (File with size 0 loaded)
1807 82 common/cmd_net.c trying automatic boot
1808 83 common/cmd_net.c running autoscript
1809 -83 common/cmd_net.c some error in automatic boot or autoscript
1810 84 common/cmd_net.c end without errors
wdenkc6097192002-11-03 00:24:07 +00001811
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001812FIT uImage format:
1813
1814 Arg Where When
1815 100 common/cmd_bootm.c Kernel FIT Image has correct format
1816 -100 common/cmd_bootm.c Kernel FIT Image has incorrect format
1817 101 common/cmd_bootm.c No Kernel subimage unit name, using configuration
1818 -101 common/cmd_bootm.c Can't get configuration for kernel subimage
1819 102 common/cmd_bootm.c Kernel unit name specified
1820 -103 common/cmd_bootm.c Can't get kernel subimage node offset
Marian Balakowiczf773bea2008-03-12 10:35:46 +01001821 103 common/cmd_bootm.c Found configuration node
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001822 104 common/cmd_bootm.c Got kernel subimage node offset
1823 -104 common/cmd_bootm.c Kernel subimage hash verification failed
1824 105 common/cmd_bootm.c Kernel subimage hash verification OK
1825 -105 common/cmd_bootm.c Kernel subimage is for unsupported architecture
1826 106 common/cmd_bootm.c Architecture check OK
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001827 -106 common/cmd_bootm.c Kernel subimage has wrong type
1828 107 common/cmd_bootm.c Kernel subimage type OK
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001829 -107 common/cmd_bootm.c Can't get kernel subimage data/size
1830 108 common/cmd_bootm.c Got kernel subimage data/size
1831 -108 common/cmd_bootm.c Wrong image type (not legacy, FIT)
1832 -109 common/cmd_bootm.c Can't get kernel subimage type
1833 -110 common/cmd_bootm.c Can't get kernel subimage comp
1834 -111 common/cmd_bootm.c Can't get kernel subimage os
1835 -112 common/cmd_bootm.c Can't get kernel subimage load address
1836 -113 common/cmd_bootm.c Image uncompress/copy overwrite error
1837
1838 120 common/image.c Start initial ramdisk verification
1839 -120 common/image.c Ramdisk FIT image has incorrect format
1840 121 common/image.c Ramdisk FIT image has correct format
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001841 122 common/image.c No ramdisk subimage unit name, using configuration
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001842 -122 common/image.c Can't get configuration for ramdisk subimage
1843 123 common/image.c Ramdisk unit name specified
1844 -124 common/image.c Can't get ramdisk subimage node offset
1845 125 common/image.c Got ramdisk subimage node offset
1846 -125 common/image.c Ramdisk subimage hash verification failed
1847 126 common/image.c Ramdisk subimage hash verification OK
1848 -126 common/image.c Ramdisk subimage for unsupported architecture
1849 127 common/image.c Architecture check OK
1850 -127 common/image.c Can't get ramdisk subimage data/size
1851 128 common/image.c Got ramdisk subimage data/size
1852 129 common/image.c Can't get ramdisk load address
1853 -129 common/image.c Got ramdisk load address
1854
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001855 -130 common/cmd_doc.c Incorrect FIT image format
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001856 131 common/cmd_doc.c FIT image format OK
1857
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001858 -140 common/cmd_ide.c Incorrect FIT image format
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001859 141 common/cmd_ide.c FIT image format OK
1860
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001861 -150 common/cmd_nand.c Incorrect FIT image format
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001862 151 common/cmd_nand.c FIT image format OK
1863
1864
wdenkc6097192002-11-03 00:24:07 +00001865Modem Support:
1866--------------
1867
wdenk85ec0bc2003-03-31 16:34:49 +00001868[so far only for SMDK2400 and TRAB boards]
wdenkc6097192002-11-03 00:24:07 +00001869
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001870- Modem support enable:
wdenkc6097192002-11-03 00:24:07 +00001871 CONFIG_MODEM_SUPPORT
1872
1873- RTS/CTS Flow control enable:
1874 CONFIG_HWFLOW
1875
1876- Modem debug support:
1877 CONFIG_MODEM_SUPPORT_DEBUG
1878
wdenk43d96162003-03-06 00:02:04 +00001879 Enables debugging stuff (char screen[1024], dbg())
1880 for modem support. Useful only with BDI2000.
wdenkc6097192002-11-03 00:24:07 +00001881
wdenka8c7c702003-12-06 19:49:23 +00001882- Interrupt support (PPC):
1883
wdenkd4ca31c2004-01-02 14:00:00 +00001884 There are common interrupt_init() and timer_interrupt()
1885 for all PPC archs. interrupt_init() calls interrupt_init_cpu()
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001886 for CPU specific initialization. interrupt_init_cpu()
wdenkd4ca31c2004-01-02 14:00:00 +00001887 should set decrementer_count to appropriate value. If
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001888 CPU resets decrementer automatically after interrupt
wdenkd4ca31c2004-01-02 14:00:00 +00001889 (ppc4xx) it should set decrementer_count to zero.
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001890 timer_interrupt() calls timer_interrupt_cpu() for CPU
wdenkd4ca31c2004-01-02 14:00:00 +00001891 specific handling. If board has watchdog / status_led
1892 / other_activity_monitor it works automatically from
1893 general timer_interrupt().
wdenka8c7c702003-12-06 19:49:23 +00001894
wdenkc6097192002-11-03 00:24:07 +00001895- General:
1896
wdenk43d96162003-03-06 00:02:04 +00001897 In the target system modem support is enabled when a
1898 specific key (key combination) is pressed during
1899 power-on. Otherwise U-Boot will boot normally
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001900 (autoboot). The key_pressed() function is called from
wdenk43d96162003-03-06 00:02:04 +00001901 board_init(). Currently key_pressed() is a dummy
1902 function, returning 1 and thus enabling modem
1903 initialization.
wdenkc6097192002-11-03 00:24:07 +00001904
wdenk43d96162003-03-06 00:02:04 +00001905 If there are no modem init strings in the
1906 environment, U-Boot proceed to autoboot; the
1907 previous output (banner, info printfs) will be
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001908 suppressed, though.
wdenkc6097192002-11-03 00:24:07 +00001909
1910 See also: doc/README.Modem
1911
1912
wdenkc6097192002-11-03 00:24:07 +00001913Configuration Settings:
1914-----------------------
1915
1916- CFG_LONGHELP: Defined when you want long help messages included;
1917 undefine this when you're short of memory.
1918
1919- CFG_PROMPT: This is what U-Boot prints on the console to
1920 prompt for user input.
1921
1922- CFG_CBSIZE: Buffer size for input from the Console
1923
1924- CFG_PBSIZE: Buffer size for Console output
1925
1926- CFG_MAXARGS: max. Number of arguments accepted for monitor commands
1927
1928- CFG_BARGSIZE: Buffer size for Boot Arguments which are passed to
1929 the application (usually a Linux kernel) when it is
1930 booted
1931
1932- CFG_BAUDRATE_TABLE:
1933 List of legal baudrate settings for this board.
1934
1935- CFG_CONSOLE_INFO_QUIET
wdenk8bde7f72003-06-27 21:31:46 +00001936 Suppress display of console information at boot.
wdenkc6097192002-11-03 00:24:07 +00001937
1938- CFG_CONSOLE_IS_IN_ENV
wdenk8bde7f72003-06-27 21:31:46 +00001939 If the board specific function
1940 extern int overwrite_console (void);
1941 returns 1, the stdin, stderr and stdout are switched to the
wdenkc6097192002-11-03 00:24:07 +00001942 serial port, else the settings in the environment are used.
1943
1944- CFG_CONSOLE_OVERWRITE_ROUTINE
wdenk8bde7f72003-06-27 21:31:46 +00001945 Enable the call to overwrite_console().
wdenkc6097192002-11-03 00:24:07 +00001946
1947- CFG_CONSOLE_ENV_OVERWRITE
1948 Enable overwrite of previous console environment settings.
1949
1950- CFG_MEMTEST_START, CFG_MEMTEST_END:
1951 Begin and End addresses of the area used by the
1952 simple memory test.
1953
1954- CFG_ALT_MEMTEST:
wdenk8bde7f72003-06-27 21:31:46 +00001955 Enable an alternate, more extensive memory test.
wdenkc6097192002-11-03 00:24:07 +00001956
wdenk5f535fe2003-09-18 09:21:33 +00001957- CFG_MEMTEST_SCRATCH:
1958 Scratch address used by the alternate memory test
1959 You only need to set this if address zero isn't writeable
1960
Stefan Roese14f73ca2008-03-26 10:14:11 +01001961- CFG_MEM_TOP_HIDE (PPC only):
1962 If CFG_MEM_TOP_HIDE is defined in the board config header,
1963 this specified memory area will get subtracted from the top
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001964 (end) of RAM and won't get "touched" at all by U-Boot. By
Stefan Roese14f73ca2008-03-26 10:14:11 +01001965 fixing up gd->ram_size the Linux kernel should gets passed
1966 the now "corrected" memory size and won't touch it either.
1967 This should work for arch/ppc and arch/powerpc. Only Linux
Stefan Roese5e12e752008-03-28 11:02:53 +01001968 board ports in arch/powerpc with bootwrapper support that
Stefan Roese14f73ca2008-03-26 10:14:11 +01001969 recalculate the memory size from the SDRAM controller setup
Stefan Roese5e12e752008-03-28 11:02:53 +01001970 will have to get fixed in Linux additionally.
Stefan Roese14f73ca2008-03-26 10:14:11 +01001971
1972 This option can be used as a workaround for the 440EPx/GRx
1973 CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
1974 be touched.
1975
1976 WARNING: Please make sure that this value is a multiple of
1977 the Linux page size (normally 4k). If this is not the case,
1978 then the end address of the Linux memory will be located at a
1979 non page size aligned address and this could cause major
1980 problems.
1981
wdenkc6097192002-11-03 00:24:07 +00001982- CFG_TFTP_LOADADDR:
1983 Default load address for network file downloads
1984
1985- CFG_LOADS_BAUD_CHANGE:
1986 Enable temporary baudrate change while serial download
1987
1988- CFG_SDRAM_BASE:
1989 Physical start address of SDRAM. _Must_ be 0 here.
1990
1991- CFG_MBIO_BASE:
1992 Physical start address of Motherboard I/O (if using a
1993 Cogent motherboard)
1994
1995- CFG_FLASH_BASE:
1996 Physical start address of Flash memory.
1997
1998- CFG_MONITOR_BASE:
1999 Physical start address of boot monitor code (set by
2000 make config files to be same as the text base address
2001 (TEXT_BASE) used when linking) - same as
2002 CFG_FLASH_BASE when booting from flash.
2003
2004- CFG_MONITOR_LEN:
wdenk8bde7f72003-06-27 21:31:46 +00002005 Size of memory reserved for monitor code, used to
2006 determine _at_compile_time_ (!) if the environment is
2007 embedded within the U-Boot image, or in a separate
2008 flash sector.
wdenkc6097192002-11-03 00:24:07 +00002009
2010- CFG_MALLOC_LEN:
2011 Size of DRAM reserved for malloc() use.
2012
Stefan Roese15940c92006-03-13 11:16:36 +01002013- CFG_BOOTM_LEN:
2014 Normally compressed uImages are limited to an
2015 uncompressed size of 8 MBytes. If this is not enough,
2016 you can define CFG_BOOTM_LEN in your board config file
2017 to adjust this setting to your needs.
2018
wdenkc6097192002-11-03 00:24:07 +00002019- CFG_BOOTMAPSZ:
2020 Maximum size of memory mapped by the startup code of
2021 the Linux kernel; all data that must be processed by
Bartlomiej Sieka7d721e32008-04-14 15:44:16 +02002022 the Linux kernel (bd_info, boot arguments, FDT blob if
2023 used) must be put below this limit, unless "bootm_low"
2024 enviroment variable is defined and non-zero. In such case
2025 all data for the Linux kernel must be between "bootm_low"
2026 and "bootm_low" + CFG_BOOTMAPSZ.
wdenkc6097192002-11-03 00:24:07 +00002027
2028- CFG_MAX_FLASH_BANKS:
2029 Max number of Flash memory banks
2030
2031- CFG_MAX_FLASH_SECT:
2032 Max number of sectors on a Flash chip
2033
2034- CFG_FLASH_ERASE_TOUT:
2035 Timeout for Flash erase operations (in ms)
2036
2037- CFG_FLASH_WRITE_TOUT:
2038 Timeout for Flash write operations (in ms)
2039
wdenk8564acf2003-07-14 22:13:32 +00002040- CFG_FLASH_LOCK_TOUT
2041 Timeout for Flash set sector lock bit operation (in ms)
2042
2043- CFG_FLASH_UNLOCK_TOUT
2044 Timeout for Flash clear lock bits operation (in ms)
2045
2046- CFG_FLASH_PROTECTION
2047 If defined, hardware flash sectors protection is used
2048 instead of U-Boot software protection.
2049
wdenkc6097192002-11-03 00:24:07 +00002050- CFG_DIRECT_FLASH_TFTP:
2051
2052 Enable TFTP transfers directly to flash memory;
2053 without this option such a download has to be
2054 performed in two steps: (1) download to RAM, and (2)
2055 copy from RAM to flash.
2056
2057 The two-step approach is usually more reliable, since
2058 you can check if the download worked before you erase
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002059 the flash, but in some situations (when system RAM is
2060 too limited to allow for a temporary copy of the
wdenkc6097192002-11-03 00:24:07 +00002061 downloaded image) this option may be very useful.
2062
2063- CFG_FLASH_CFI:
wdenk43d96162003-03-06 00:02:04 +00002064 Define if the flash driver uses extra elements in the
wdenk5653fc32004-02-08 22:55:38 +00002065 common flash structure for storing flash geometry.
2066
2067- CFG_FLASH_CFI_DRIVER
2068 This option also enables the building of the cfi_flash driver
2069 in the drivers directory
wdenkc6097192002-11-03 00:24:07 +00002070
Guennadi Liakhovetski96ef8312008-04-03 13:36:02 +02002071- CFG_FLASH_USE_BUFFER_WRITE
2072 Use buffered writes to flash.
2073
2074- CONFIG_FLASH_SPANSION_S29WS_N
2075 s29ws-n MirrorBit flash has non-standard addresses for buffered
2076 write commands.
2077
Stefan Roese5568e612005-11-22 13:20:42 +01002078- CFG_FLASH_QUIET_TEST
2079 If this option is defined, the common CFI flash doesn't
2080 print it's warning upon not recognized FLASH banks. This
2081 is useful, if some of the configured banks are only
2082 optionally available.
2083
Jerry Van Baren9a042e92008-03-08 13:48:01 -05002084- CONFIG_FLASH_SHOW_PROGRESS
2085 If defined (must be an integer), print out countdown
2086 digits and dots. Recommended value: 45 (9..1) for 80
2087 column displays, 15 (3..1) for 40 column displays.
2088
stroese53cf9432003-06-05 15:39:44 +00002089- CFG_RX_ETH_BUFFER:
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002090 Defines the number of Ethernet receive buffers. On some
2091 Ethernet controllers it is recommended to set this value
stroese53cf9432003-06-05 15:39:44 +00002092 to 8 or even higher (EEPRO100 or 405 EMAC), since all
2093 buffers can be full shortly after enabling the interface
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002094 on high Ethernet traffic.
stroese53cf9432003-06-05 15:39:44 +00002095 Defaults to 4 if not defined.
2096
wdenkc6097192002-11-03 00:24:07 +00002097The following definitions that deal with the placement and management
2098of environment data (variable area); in general, we support the
2099following configurations:
2100
2101- CFG_ENV_IS_IN_FLASH:
2102
2103 Define this if the environment is in flash memory.
2104
2105 a) The environment occupies one whole flash sector, which is
2106 "embedded" in the text segment with the U-Boot code. This
2107 happens usually with "bottom boot sector" or "top boot
2108 sector" type flash chips, which have several smaller
2109 sectors at the start or the end. For instance, such a
2110 layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
2111 such a case you would place the environment in one of the
2112 4 kB sectors - with U-Boot code before and after it. With
2113 "top boot sector" type flash chips, you would put the
2114 environment in one of the last sectors, leaving a gap
2115 between U-Boot and the environment.
2116
2117 - CFG_ENV_OFFSET:
2118
2119 Offset of environment data (variable area) to the
2120 beginning of flash memory; for instance, with bottom boot
2121 type flash chips the second sector can be used: the offset
2122 for this sector is given here.
2123
2124 CFG_ENV_OFFSET is used relative to CFG_FLASH_BASE.
2125
2126 - CFG_ENV_ADDR:
2127
2128 This is just another way to specify the start address of
2129 the flash sector containing the environment (instead of
2130 CFG_ENV_OFFSET).
2131
2132 - CFG_ENV_SECT_SIZE:
2133
2134 Size of the sector containing the environment.
2135
2136
2137 b) Sometimes flash chips have few, equal sized, BIG sectors.
2138 In such a case you don't want to spend a whole sector for
2139 the environment.
2140
2141 - CFG_ENV_SIZE:
2142
2143 If you use this in combination with CFG_ENV_IS_IN_FLASH
2144 and CFG_ENV_SECT_SIZE, you can specify to use only a part
2145 of this flash sector for the environment. This saves
2146 memory for the RAM copy of the environment.
2147
2148 It may also save flash memory if you decide to use this
2149 when your environment is "embedded" within U-Boot code,
2150 since then the remainder of the flash sector could be used
2151 for U-Boot code. It should be pointed out that this is
2152 STRONGLY DISCOURAGED from a robustness point of view:
2153 updating the environment in flash makes it always
2154 necessary to erase the WHOLE sector. If something goes
2155 wrong before the contents has been restored from a copy in
2156 RAM, your target system will be dead.
2157
2158 - CFG_ENV_ADDR_REDUND
2159 CFG_ENV_SIZE_REDUND
2160
wdenk43d96162003-03-06 00:02:04 +00002161 These settings describe a second storage area used to hold
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002162 a redundant copy of the environment data, so that there is
wdenk3e386912003-04-05 00:53:31 +00002163 a valid backup copy in case there is a power failure during
wdenk43d96162003-03-06 00:02:04 +00002164 a "saveenv" operation.
wdenkc6097192002-11-03 00:24:07 +00002165
2166BE CAREFUL! Any changes to the flash layout, and some changes to the
2167source code will make it necessary to adapt <board>/u-boot.lds*
2168accordingly!
2169
2170
2171- CFG_ENV_IS_IN_NVRAM:
2172
2173 Define this if you have some non-volatile memory device
2174 (NVRAM, battery buffered SRAM) which you want to use for the
2175 environment.
2176
2177 - CFG_ENV_ADDR:
2178 - CFG_ENV_SIZE:
2179
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002180 These two #defines are used to determine the memory area you
wdenkc6097192002-11-03 00:24:07 +00002181 want to use for environment. It is assumed that this memory
2182 can just be read and written to, without any special
2183 provision.
2184
2185BE CAREFUL! The first access to the environment happens quite early
2186in U-Boot initalization (when we try to get the setting of for the
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002187console baudrate). You *MUST* have mapped your NVRAM area then, or
wdenkc6097192002-11-03 00:24:07 +00002188U-Boot will hang.
2189
2190Please note that even with NVRAM we still use a copy of the
2191environment in RAM: we could work on NVRAM directly, but we want to
2192keep settings there always unmodified except somebody uses "saveenv"
2193to save the current settings.
2194
2195
2196- CFG_ENV_IS_IN_EEPROM:
2197
2198 Use this if you have an EEPROM or similar serial access
2199 device and a driver for it.
2200
2201 - CFG_ENV_OFFSET:
2202 - CFG_ENV_SIZE:
2203
2204 These two #defines specify the offset and size of the
2205 environment area within the total memory of your EEPROM.
2206
2207 - CFG_I2C_EEPROM_ADDR:
2208 If defined, specified the chip address of the EEPROM device.
2209 The default address is zero.
2210
2211 - CFG_EEPROM_PAGE_WRITE_BITS:
2212 If defined, the number of bits used to address bytes in a
2213 single page in the EEPROM device. A 64 byte page, for example
2214 would require six bits.
2215
2216 - CFG_EEPROM_PAGE_WRITE_DELAY_MS:
2217 If defined, the number of milliseconds to delay between
wdenkba56f622004-02-06 23:19:44 +00002218 page writes. The default is zero milliseconds.
wdenkc6097192002-11-03 00:24:07 +00002219
2220 - CFG_I2C_EEPROM_ADDR_LEN:
2221 The length in bytes of the EEPROM memory array address. Note
2222 that this is NOT the chip address length!
2223
wdenk5cf91d62004-04-23 20:32:05 +00002224 - CFG_I2C_EEPROM_ADDR_OVERFLOW:
2225 EEPROM chips that implement "address overflow" are ones
2226 like Catalyst 24WC04/08/16 which has 9/10/11 bits of
2227 address and the extra bits end up in the "chip address" bit
2228 slots. This makes a 24WC08 (1Kbyte) chip look like four 256
2229 byte chips.
2230
2231 Note that we consider the length of the address field to
2232 still be one byte because the extra address bits are hidden
2233 in the chip address.
2234
wdenkc6097192002-11-03 00:24:07 +00002235 - CFG_EEPROM_SIZE:
2236 The size in bytes of the EEPROM device.
2237
wdenkc6097192002-11-03 00:24:07 +00002238
wdenk5779d8d2003-12-06 23:55:10 +00002239- CFG_ENV_IS_IN_DATAFLASH:
2240
wdenkd4ca31c2004-01-02 14:00:00 +00002241 Define this if you have a DataFlash memory device which you
wdenk5779d8d2003-12-06 23:55:10 +00002242 want to use for the environment.
2243
2244 - CFG_ENV_OFFSET:
2245 - CFG_ENV_ADDR:
2246 - CFG_ENV_SIZE:
2247
2248 These three #defines specify the offset and size of the
2249 environment area within the total memory of your DataFlash placed
2250 at the specified address.
2251
wdenk13a56952004-06-09 14:58:14 +00002252- CFG_ENV_IS_IN_NAND:
2253
2254 Define this if you have a NAND device which you want to use
2255 for the environment.
2256
2257 - CFG_ENV_OFFSET:
2258 - CFG_ENV_SIZE:
2259
2260 These two #defines specify the offset and size of the environment
2261 area within the first NAND device.
wdenk5779d8d2003-12-06 23:55:10 +00002262
Markus Klotzbuechere443c942006-03-20 18:02:44 +01002263 - CFG_ENV_OFFSET_REDUND
2264
2265 This setting describes a second storage area of CFG_ENV_SIZE
2266 size used to hold a redundant copy of the environment data,
2267 so that there is a valid backup copy in case there is a
2268 power failure during a "saveenv" operation.
2269
2270 Note: CFG_ENV_OFFSET and CFG_ENV_OFFSET_REDUND must be aligned
2271 to a block boundary, and CFG_ENV_SIZE must be a multiple of
2272 the NAND devices block size.
2273
wdenkc6097192002-11-03 00:24:07 +00002274- CFG_SPI_INIT_OFFSET
2275
2276 Defines offset to the initial SPI buffer area in DPRAM. The
2277 area is used at an early stage (ROM part) if the environment
2278 is configured to reside in the SPI EEPROM: We need a 520 byte
2279 scratch DPRAM area. It is used between the two initialization
2280 calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
2281 to be a good choice since it makes it far enough from the
2282 start of the data area as well as from the stack pointer.
2283
Bruce Adlere881cb52007-11-02 13:15:42 -07002284Please note that the environment is read-only until the monitor
wdenkc6097192002-11-03 00:24:07 +00002285has been relocated to RAM and a RAM copy of the environment has been
2286created; also, when using EEPROM you will have to use getenv_r()
2287until then to read environment variables.
2288
wdenk85ec0bc2003-03-31 16:34:49 +00002289The environment is protected by a CRC32 checksum. Before the monitor
2290is relocated into RAM, as a result of a bad CRC you will be working
2291with the compiled-in default environment - *silently*!!! [This is
2292necessary, because the first environment variable we need is the
2293"baudrate" setting for the console - if we have a bad CRC, we don't
2294have any device yet where we could complain.]
wdenkc6097192002-11-03 00:24:07 +00002295
2296Note: once the monitor has been relocated, then it will complain if
2297the default environment is used; a new CRC is computed as soon as you
wdenk85ec0bc2003-03-31 16:34:49 +00002298use the "saveenv" command to store a valid environment.
wdenkc6097192002-11-03 00:24:07 +00002299
wdenkfc3e2162003-10-08 22:33:00 +00002300- CFG_FAULT_ECHO_LINK_DOWN:
wdenk42d1f032003-10-15 23:53:47 +00002301 Echo the inverted Ethernet link state to the fault LED.
wdenkfc3e2162003-10-08 22:33:00 +00002302
2303 Note: If this option is active, then CFG_FAULT_MII_ADDR
2304 also needs to be defined.
2305
2306- CFG_FAULT_MII_ADDR:
wdenk42d1f032003-10-15 23:53:47 +00002307 MII address of the PHY to check for the Ethernet link state.
wdenkc6097192002-11-03 00:24:07 +00002308
wdenkc40b2952004-03-13 23:29:43 +00002309- CFG_64BIT_VSPRINTF:
2310 Makes vsprintf (and all *printf functions) support printing
2311 of 64bit values by using the L quantifier
2312
2313- CFG_64BIT_STRTOUL:
2314 Adds simple_strtoull that returns a 64bit value
2315
wdenkc6097192002-11-03 00:24:07 +00002316Low Level (hardware related) configuration options:
wdenkdc7c9a12003-03-26 06:55:25 +00002317---------------------------------------------------
wdenkc6097192002-11-03 00:24:07 +00002318
2319- CFG_CACHELINE_SIZE:
2320 Cache Line Size of the CPU.
2321
2322- CFG_DEFAULT_IMMR:
2323 Default address of the IMMR after system reset.
wdenk2535d602003-07-17 23:16:40 +00002324
wdenk42d1f032003-10-15 23:53:47 +00002325 Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
2326 and RPXsuper) to be able to adjust the position of
2327 the IMMR register after a reset.
wdenkc6097192002-11-03 00:24:07 +00002328
wdenk7f6c2cb2002-11-10 22:06:23 +00002329- Floppy Disk Support:
2330 CFG_FDC_DRIVE_NUMBER
2331
2332 the default drive number (default value 0)
2333
2334 CFG_ISA_IO_STRIDE
2335
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002336 defines the spacing between FDC chipset registers
wdenk7f6c2cb2002-11-10 22:06:23 +00002337 (default value 1)
2338
2339 CFG_ISA_IO_OFFSET
2340
wdenk43d96162003-03-06 00:02:04 +00002341 defines the offset of register from address. It
2342 depends on which part of the data bus is connected to
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002343 the FDC chipset. (default value 0)
wdenk7f6c2cb2002-11-10 22:06:23 +00002344
wdenk43d96162003-03-06 00:02:04 +00002345 If CFG_ISA_IO_STRIDE CFG_ISA_IO_OFFSET and
2346 CFG_FDC_DRIVE_NUMBER are undefined, they take their
2347 default value.
wdenk7f6c2cb2002-11-10 22:06:23 +00002348
wdenk43d96162003-03-06 00:02:04 +00002349 if CFG_FDC_HW_INIT is defined, then the function
2350 fdc_hw_init() is called at the beginning of the FDC
2351 setup. fdc_hw_init() must be provided by the board
2352 source code. It is used to make hardware dependant
2353 initializations.
wdenk7f6c2cb2002-11-10 22:06:23 +00002354
wdenk25d67122004-12-10 11:40:40 +00002355- CFG_IMMR: Physical address of the Internal Memory.
wdenkefe2a4d2004-12-16 21:44:03 +00002356 DO NOT CHANGE unless you know exactly what you're
wdenk25d67122004-12-10 11:40:40 +00002357 doing! (11-4) [MPC8xx/82xx systems only]
wdenkc6097192002-11-03 00:24:07 +00002358
2359- CFG_INIT_RAM_ADDR:
2360
wdenk7152b1d2003-09-05 23:19:14 +00002361 Start address of memory area that can be used for
wdenkc6097192002-11-03 00:24:07 +00002362 initial data and stack; please note that this must be
2363 writable memory that is working WITHOUT special
2364 initialization, i. e. you CANNOT use normal RAM which
2365 will become available only after programming the
2366 memory controller and running certain initialization
2367 sequences.
2368
2369 U-Boot uses the following memory types:
2370 - MPC8xx and MPC8260: IMMR (internal memory of the CPU)
2371 - MPC824X: data cache
2372 - PPC4xx: data cache
2373
wdenk85ec0bc2003-03-31 16:34:49 +00002374- CFG_GBL_DATA_OFFSET:
wdenkc6097192002-11-03 00:24:07 +00002375
2376 Offset of the initial data structure in the memory
2377 area defined by CFG_INIT_RAM_ADDR. Usually
wdenk85ec0bc2003-03-31 16:34:49 +00002378 CFG_GBL_DATA_OFFSET is chosen such that the initial
wdenkc6097192002-11-03 00:24:07 +00002379 data is located at the end of the available space
2380 (sometimes written as (CFG_INIT_RAM_END -
2381 CFG_INIT_DATA_SIZE), and the initial stack is just
2382 below that area (growing from (CFG_INIT_RAM_ADDR +
wdenk85ec0bc2003-03-31 16:34:49 +00002383 CFG_GBL_DATA_OFFSET) downward.
wdenkc6097192002-11-03 00:24:07 +00002384
2385 Note:
2386 On the MPC824X (or other systems that use the data
2387 cache for initial memory) the address chosen for
2388 CFG_INIT_RAM_ADDR is basically arbitrary - it must
2389 point to an otherwise UNUSED address space between
2390 the top of RAM and the start of the PCI space.
2391
2392- CFG_SIUMCR: SIU Module Configuration (11-6)
2393
2394- CFG_SYPCR: System Protection Control (11-9)
2395
2396- CFG_TBSCR: Time Base Status and Control (11-26)
2397
2398- CFG_PISCR: Periodic Interrupt Status and Control (11-31)
2399
2400- CFG_PLPRCR: PLL, Low-Power, and Reset Control Register (15-30)
2401
2402- CFG_SCCR: System Clock and reset Control Register (15-27)
2403
2404- CFG_OR_TIMING_SDRAM:
2405 SDRAM timing
2406
2407- CFG_MAMR_PTA:
2408 periodic timer for refresh
2409
2410- CFG_DER: Debug Event Register (37-47)
2411
2412- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CFG_REMAP_OR_AM,
2413 CFG_PRELIM_OR_AM, CFG_OR_TIMING_FLASH, CFG_OR0_REMAP,
2414 CFG_OR0_PRELIM, CFG_BR0_PRELIM, CFG_OR1_REMAP, CFG_OR1_PRELIM,
2415 CFG_BR1_PRELIM:
2416 Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
2417
2418- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
2419 CFG_OR_TIMING_SDRAM, CFG_OR2_PRELIM, CFG_BR2_PRELIM,
2420 CFG_OR3_PRELIM, CFG_BR3_PRELIM:
2421 Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
2422
2423- CFG_MAMR_PTA, CFG_MPTPR_2BK_4K, CFG_MPTPR_1BK_4K, CFG_MPTPR_2BK_8K,
2424 CFG_MPTPR_1BK_8K, CFG_MAMR_8COL, CFG_MAMR_9COL:
2425 Machine Mode Register and Memory Periodic Timer
2426 Prescaler definitions (SDRAM timing)
2427
2428- CFG_I2C_UCODE_PATCH, CFG_I2C_DPMEM_OFFSET [0x1FC0]:
2429 enable I2C microcode relocation patch (MPC8xx);
2430 define relocation offset in DPRAM [DSP2]
2431
Heiko Schocherb423d052008-01-11 01:12:07 +01002432- CFG_SMC_UCODE_PATCH, CFG_SMC_DPMEM_OFFSET [0x1FC0]:
2433 enable SMC microcode relocation patch (MPC8xx);
2434 define relocation offset in DPRAM [SMC1]
2435
wdenkc6097192002-11-03 00:24:07 +00002436- CFG_SPI_UCODE_PATCH, CFG_SPI_DPMEM_OFFSET [0x1FC0]:
2437 enable SPI microcode relocation patch (MPC8xx);
2438 define relocation offset in DPRAM [SCC4]
2439
2440- CFG_USE_OSCCLK:
2441 Use OSCM clock mode on MBX8xx board. Be careful,
2442 wrong setting might damage your board. Read
2443 doc/README.MBX before setting this variable!
2444
wdenkea909b72002-11-21 23:11:29 +00002445- CFG_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
wdenk43d96162003-03-06 00:02:04 +00002446 Offset of the bootmode word in DPRAM used by post
2447 (Power On Self Tests). This definition overrides
2448 #define'd default value in commproc.h resp.
2449 cpm_8260.h.
wdenkea909b72002-11-21 23:11:29 +00002450
stroese1d49b1f2003-05-23 11:39:05 +00002451- CFG_PCI_SLV_MEM_LOCAL, CFG_PCI_SLV_MEM_BUS, CFG_PICMR0_MASK_ATTRIB,
2452 CFG_PCI_MSTR0_LOCAL, CFG_PCIMSK0_MASK, CFG_PCI_MSTR1_LOCAL,
2453 CFG_PCIMSK1_MASK, CFG_PCI_MSTR_MEM_LOCAL, CFG_PCI_MSTR_MEM_BUS,
2454 CFG_CPU_PCI_MEM_START, CFG_PCI_MSTR_MEM_SIZE, CFG_POCMR0_MASK_ATTRIB,
2455 CFG_PCI_MSTR_MEMIO_LOCAL, CFG_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
2456 CFG_PCI_MSTR_MEMIO_SIZE, CFG_POCMR1_MASK_ATTRIB, CFG_PCI_MSTR_IO_LOCAL,
2457 CFG_PCI_MSTR_IO_BUS, CFG_CPU_PCI_IO_START, CFG_PCI_MSTR_IO_SIZE,
wdenk5d232d02003-05-22 22:52:13 +00002458 CFG_POCMR2_MASK_ATTRIB: (MPC826x only)
2459 Overrides the default PCI memory map in cpu/mpc8260/pci.c if set.
2460
Ben Warrenbb99ad62006-09-07 16:50:54 -04002461- CONFIG_SPD_EEPROM
Wolfgang Denk218ca722008-03-26 10:40:12 +01002462 Get DDR timing information from an I2C EEPROM. Common
2463 with pluggable memory modules such as SODIMMs
2464
Ben Warrenbb99ad62006-09-07 16:50:54 -04002465 SPD_EEPROM_ADDRESS
2466 I2C address of the SPD EEPROM
2467
2468- CFG_SPD_BUS_NUM
Wolfgang Denk218ca722008-03-26 10:40:12 +01002469 If SPD EEPROM is on an I2C bus other than the first
2470 one, specify here. Note that the value must resolve
2471 to something your driver can deal with.
Ben Warrenbb99ad62006-09-07 16:50:54 -04002472
Timur Tabi2ad6b512006-10-31 18:44:42 -06002473- CFG_83XX_DDR_USES_CS0
Wolfgang Denk218ca722008-03-26 10:40:12 +01002474 Only for 83xx systems. If specified, then DDR should
2475 be configured using CS0 and CS1 instead of CS2 and CS3.
Timur Tabi2ad6b512006-10-31 18:44:42 -06002476
2477- CFG_83XX_DDR_USES_CS0
Wolfgang Denk218ca722008-03-26 10:40:12 +01002478 Only for 83xx systems. If specified, then DDR should
2479 be configured using CS0 and CS1 instead of CS2 and CS3.
Timur Tabi2ad6b512006-10-31 18:44:42 -06002480
wdenkc26e4542004-04-18 10:13:26 +00002481- CONFIG_ETHER_ON_FEC[12]
2482 Define to enable FEC[12] on a 8xx series processor.
2483
2484- CONFIG_FEC[12]_PHY
2485 Define to the hardcoded PHY address which corresponds
wdenk6e592382004-04-18 17:39:38 +00002486 to the given FEC; i. e.
2487 #define CONFIG_FEC1_PHY 4
wdenkc26e4542004-04-18 10:13:26 +00002488 means that the PHY with address 4 is connected to FEC1
2489
2490 When set to -1, means to probe for first available.
2491
2492- CONFIG_FEC[12]_PHY_NORXERR
2493 The PHY does not have a RXERR line (RMII only).
2494 (so program the FEC to ignore it).
2495
2496- CONFIG_RMII
2497 Enable RMII mode for all FECs.
2498 Note that this is a global option, we can't
2499 have one FEC in standard MII mode and another in RMII mode.
2500
wdenk5cf91d62004-04-23 20:32:05 +00002501- CONFIG_CRC32_VERIFY
2502 Add a verify option to the crc32 command.
2503 The syntax is:
2504
2505 => crc32 -v <address> <count> <crc32>
2506
2507 Where address/count indicate a memory area
2508 and crc32 is the correct crc32 which the
2509 area should have.
2510
wdenk56523f12004-07-11 17:40:54 +00002511- CONFIG_LOOPW
2512 Add the "loopw" memory command. This only takes effect if
Jon Loeliger602ad3b2007-06-11 19:03:39 -05002513 the memory commands are activated globally (CONFIG_CMD_MEM).
wdenk56523f12004-07-11 17:40:54 +00002514
stroese7b466642004-12-16 18:46:55 +00002515- CONFIG_MX_CYCLIC
2516 Add the "mdc" and "mwc" memory commands. These are cyclic
2517 "md/mw" commands.
2518 Examples:
2519
wdenkefe2a4d2004-12-16 21:44:03 +00002520 => mdc.b 10 4 500
stroese7b466642004-12-16 18:46:55 +00002521 This command will print 4 bytes (10,11,12,13) each 500 ms.
2522
wdenkefe2a4d2004-12-16 21:44:03 +00002523 => mwc.l 100 12345678 10
stroese7b466642004-12-16 18:46:55 +00002524 This command will write 12345678 to address 100 all 10 ms.
2525
wdenkefe2a4d2004-12-16 21:44:03 +00002526 This only takes effect if the memory commands are activated
Jon Loeliger602ad3b2007-06-11 19:03:39 -05002527 globally (CONFIG_CMD_MEM).
stroese7b466642004-12-16 18:46:55 +00002528
wdenk8aa1a2d2005-04-04 12:44:11 +00002529- CONFIG_SKIP_LOWLEVEL_INIT
2530- CONFIG_SKIP_RELOCATE_UBOOT
2531
wdenk3c2b3d42005-04-05 23:32:21 +00002532 [ARM only] If these variables are defined, then
2533 certain low level initializations (like setting up
2534 the memory controller) are omitted and/or U-Boot does
2535 not relocate itself into RAM.
2536 Normally these variables MUST NOT be defined. The
2537 only exception is when U-Boot is loaded (to RAM) by
2538 some other boot loader or by a debugger which
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002539 performs these initializations itself.
wdenk8aa1a2d2005-04-04 12:44:11 +00002540
wdenk400558b2005-04-02 23:52:25 +00002541
wdenkc6097192002-11-03 00:24:07 +00002542Building the Software:
2543======================
2544
Wolfgang Denk218ca722008-03-26 10:40:12 +01002545Building U-Boot has been tested in several native build environments
2546and in many different cross environments. Of course we cannot support
2547all possibly existing versions of cross development tools in all
2548(potentially obsolete) versions. In case of tool chain problems we
2549recommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
2550which is extensively used to build and test U-Boot.
wdenkc6097192002-11-03 00:24:07 +00002551
Wolfgang Denk218ca722008-03-26 10:40:12 +01002552If you are not using a native environment, it is assumed that you
2553have GNU cross compiling tools available in your path. In this case,
2554you must set the environment variable CROSS_COMPILE in your shell.
2555Note that no changes to the Makefile or any other source files are
2556necessary. For example using the ELDK on a 4xx CPU, please enter:
wdenkc6097192002-11-03 00:24:07 +00002557
Wolfgang Denk218ca722008-03-26 10:40:12 +01002558 $ CROSS_COMPILE=ppc_4xx-
2559 $ export CROSS_COMPILE
wdenkc6097192002-11-03 00:24:07 +00002560
Wolfgang Denk218ca722008-03-26 10:40:12 +01002561U-Boot is intended to be simple to build. After installing the
2562sources you must configure U-Boot for one specific board type. This
wdenkc6097192002-11-03 00:24:07 +00002563is done by typing:
2564
2565 make NAME_config
2566
Wolfgang Denk218ca722008-03-26 10:40:12 +01002567where "NAME_config" is the name of one of the existing configu-
2568rations; see the main Makefile for supported names.
wdenk54387ac2003-10-08 22:45:44 +00002569
wdenk2729af92004-05-03 20:45:30 +00002570Note: for some board special configuration names may exist; check if
2571 additional information is available from the board vendor; for
2572 instance, the TQM823L systems are available without (standard)
2573 or with LCD support. You can select such additional "features"
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002574 when choosing the configuration, i. e.
wdenkc6097192002-11-03 00:24:07 +00002575
wdenk2729af92004-05-03 20:45:30 +00002576 make TQM823L_config
2577 - will configure for a plain TQM823L, i. e. no LCD support
wdenkc6097192002-11-03 00:24:07 +00002578
wdenk2729af92004-05-03 20:45:30 +00002579 make TQM823L_LCD_config
2580 - will configure for a TQM823L with U-Boot console on LCD
wdenkc6097192002-11-03 00:24:07 +00002581
wdenk2729af92004-05-03 20:45:30 +00002582 etc.
wdenkc6097192002-11-03 00:24:07 +00002583
wdenkc6097192002-11-03 00:24:07 +00002584
wdenk2729af92004-05-03 20:45:30 +00002585Finally, type "make all", and you should get some working U-Boot
2586images ready for download to / installation on your system:
wdenkc6097192002-11-03 00:24:07 +00002587
wdenk2729af92004-05-03 20:45:30 +00002588- "u-boot.bin" is a raw binary image
2589- "u-boot" is an image in ELF binary format
2590- "u-boot.srec" is in Motorola S-Record format
wdenkc6097192002-11-03 00:24:07 +00002591
Marian Balakowiczbaf31242006-09-07 17:25:40 +02002592By default the build is performed locally and the objects are saved
2593in the source directory. One of the two methods can be used to change
2594this behavior and build U-Boot to some external directory:
2595
25961. Add O= to the make command line invocations:
2597
2598 make O=/tmp/build distclean
2599 make O=/tmp/build NAME_config
2600 make O=/tmp/build all
2601
26022. Set environment variable BUILD_DIR to point to the desired location:
2603
2604 export BUILD_DIR=/tmp/build
2605 make distclean
2606 make NAME_config
2607 make all
2608
2609Note that the command line "O=" setting overrides the BUILD_DIR environment
2610variable.
2611
wdenkc6097192002-11-03 00:24:07 +00002612
wdenk2729af92004-05-03 20:45:30 +00002613Please be aware that the Makefiles assume you are using GNU make, so
2614for instance on NetBSD you might need to use "gmake" instead of
2615native "make".
wdenkc6097192002-11-03 00:24:07 +00002616
wdenkc6097192002-11-03 00:24:07 +00002617
wdenk2729af92004-05-03 20:45:30 +00002618If the system board that you have is not listed, then you will need
2619to port U-Boot to your hardware platform. To do this, follow these
2620steps:
wdenkc6097192002-11-03 00:24:07 +00002621
wdenk2729af92004-05-03 20:45:30 +000026221. Add a new configuration option for your board to the toplevel
2623 "Makefile" and to the "MAKEALL" script, using the existing
2624 entries as examples. Note that here and at many other places
2625 boards and other names are listed in alphabetical sort order. Please
2626 keep this order.
26272. Create a new directory to hold your board specific code. Add any
2628 files you need. In your board directory, you will need at least
2629 the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
26303. Create a new configuration file "include/configs/<board>.h" for
2631 your board
26323. If you're porting U-Boot to a new CPU, then also create a new
2633 directory to hold your CPU specific code. Add any files you need.
26344. Run "make <board>_config" with your new name.
26355. Type "make", and you should get a working "u-boot.srec" file
2636 to be installed on your target system.
26376. Debug and solve any problems that might arise.
2638 [Of course, this last step is much harder than it sounds.]
wdenkc6097192002-11-03 00:24:07 +00002639
wdenkc6097192002-11-03 00:24:07 +00002640
wdenk2729af92004-05-03 20:45:30 +00002641Testing of U-Boot Modifications, Ports to New Hardware, etc.:
2642==============================================================
wdenkc6097192002-11-03 00:24:07 +00002643
Wolfgang Denk218ca722008-03-26 10:40:12 +01002644If you have modified U-Boot sources (for instance added a new board
2645or support for new devices, a new CPU, etc.) you are expected to
wdenk2729af92004-05-03 20:45:30 +00002646provide feedback to the other developers. The feedback normally takes
2647the form of a "patch", i. e. a context diff against a certain (latest
Wolfgang Denk218ca722008-03-26 10:40:12 +01002648official or latest in the git repository) version of U-Boot sources.
wdenkc6097192002-11-03 00:24:07 +00002649
Wolfgang Denk218ca722008-03-26 10:40:12 +01002650But before you submit such a patch, please verify that your modifi-
2651cation did not break existing code. At least make sure that *ALL* of
wdenk2729af92004-05-03 20:45:30 +00002652the supported boards compile WITHOUT ANY compiler warnings. To do so,
2653just run the "MAKEALL" script, which will configure and build U-Boot
Wolfgang Denk218ca722008-03-26 10:40:12 +01002654for ALL supported system. Be warned, this will take a while. You can
2655select which (cross) compiler to use by passing a `CROSS_COMPILE'
2656environment variable to the script, i. e. to use the ELDK cross tools
2657you can type
wdenkc6097192002-11-03 00:24:07 +00002658
wdenk2729af92004-05-03 20:45:30 +00002659 CROSS_COMPILE=ppc_8xx- MAKEALL
wdenkc6097192002-11-03 00:24:07 +00002660
wdenk2729af92004-05-03 20:45:30 +00002661or to build on a native PowerPC system you can type
wdenkc6097192002-11-03 00:24:07 +00002662
wdenk2729af92004-05-03 20:45:30 +00002663 CROSS_COMPILE=' ' MAKEALL
wdenkc6097192002-11-03 00:24:07 +00002664
Wolfgang Denk218ca722008-03-26 10:40:12 +01002665When using the MAKEALL script, the default behaviour is to build
2666U-Boot in the source directory. This location can be changed by
2667setting the BUILD_DIR environment variable. Also, for each target
2668built, the MAKEALL script saves two log files (<target>.ERR and
2669<target>.MAKEALL) in the <source dir>/LOG directory. This default
2670location can be changed by setting the MAKEALL_LOGDIR environment
2671variable. For example:
Marian Balakowiczbaf31242006-09-07 17:25:40 +02002672
2673 export BUILD_DIR=/tmp/build
2674 export MAKEALL_LOGDIR=/tmp/log
2675 CROSS_COMPILE=ppc_8xx- MAKEALL
2676
Wolfgang Denk218ca722008-03-26 10:40:12 +01002677With the above settings build objects are saved in the /tmp/build,
2678log files are saved in the /tmp/log and the source tree remains clean
2679during the whole build process.
Marian Balakowiczbaf31242006-09-07 17:25:40 +02002680
2681
wdenk2729af92004-05-03 20:45:30 +00002682See also "U-Boot Porting Guide" below.
wdenkc6097192002-11-03 00:24:07 +00002683
wdenkc6097192002-11-03 00:24:07 +00002684
wdenk2729af92004-05-03 20:45:30 +00002685Monitor Commands - Overview:
2686============================
wdenkc6097192002-11-03 00:24:07 +00002687
wdenk2729af92004-05-03 20:45:30 +00002688go - start application at address 'addr'
2689run - run commands in an environment variable
2690bootm - boot application image from memory
2691bootp - boot image via network using BootP/TFTP protocol
2692tftpboot- boot image via network using TFTP protocol
2693 and env variables "ipaddr" and "serverip"
2694 (and eventually "gatewayip")
2695rarpboot- boot image via network using RARP/TFTP protocol
2696diskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd'
2697loads - load S-Record file over serial line
2698loadb - load binary file over serial line (kermit mode)
2699md - memory display
2700mm - memory modify (auto-incrementing)
2701nm - memory modify (constant address)
2702mw - memory write (fill)
2703cp - memory copy
2704cmp - memory compare
2705crc32 - checksum calculation
2706imd - i2c memory display
2707imm - i2c memory modify (auto-incrementing)
2708inm - i2c memory modify (constant address)
2709imw - i2c memory write (fill)
2710icrc32 - i2c checksum calculation
2711iprobe - probe to discover valid I2C chip addresses
2712iloop - infinite loop on address range
2713isdram - print SDRAM configuration information
2714sspi - SPI utility commands
2715base - print or set address offset
2716printenv- print environment variables
2717setenv - set environment variables
2718saveenv - save environment variables to persistent storage
2719protect - enable or disable FLASH write protection
2720erase - erase FLASH memory
2721flinfo - print FLASH memory information
2722bdinfo - print Board Info structure
2723iminfo - print header information for application image
2724coninfo - print console devices and informations
2725ide - IDE sub-system
2726loop - infinite loop on address range
wdenk56523f12004-07-11 17:40:54 +00002727loopw - infinite write loop on address range
wdenk2729af92004-05-03 20:45:30 +00002728mtest - simple RAM test
2729icache - enable or disable instruction cache
2730dcache - enable or disable data cache
2731reset - Perform RESET of the CPU
2732echo - echo args to console
2733version - print monitor version
2734help - print online help
2735? - alias for 'help'
wdenkc6097192002-11-03 00:24:07 +00002736
wdenkc6097192002-11-03 00:24:07 +00002737
wdenk2729af92004-05-03 20:45:30 +00002738Monitor Commands - Detailed Description:
2739========================================
wdenkc6097192002-11-03 00:24:07 +00002740
wdenk2729af92004-05-03 20:45:30 +00002741TODO.
wdenkc6097192002-11-03 00:24:07 +00002742
wdenk2729af92004-05-03 20:45:30 +00002743For now: just type "help <command>".
wdenkc6097192002-11-03 00:24:07 +00002744
2745
wdenk2729af92004-05-03 20:45:30 +00002746Environment Variables:
2747======================
wdenkc6097192002-11-03 00:24:07 +00002748
wdenk2729af92004-05-03 20:45:30 +00002749U-Boot supports user configuration using Environment Variables which
2750can be made persistent by saving to Flash memory.
wdenkc6097192002-11-03 00:24:07 +00002751
wdenk2729af92004-05-03 20:45:30 +00002752Environment Variables are set using "setenv", printed using
2753"printenv", and saved to Flash using "saveenv". Using "setenv"
2754without a value can be used to delete a variable from the
2755environment. As long as you don't save the environment you are
2756working with an in-memory copy. In case the Flash area containing the
2757environment is erased by accident, a default environment is provided.
wdenkc6097192002-11-03 00:24:07 +00002758
wdenk2729af92004-05-03 20:45:30 +00002759Some configuration options can be set using Environment Variables:
wdenkc6097192002-11-03 00:24:07 +00002760
wdenk2729af92004-05-03 20:45:30 +00002761 baudrate - see CONFIG_BAUDRATE
wdenkc6097192002-11-03 00:24:07 +00002762
wdenk2729af92004-05-03 20:45:30 +00002763 bootdelay - see CONFIG_BOOTDELAY
wdenkc6097192002-11-03 00:24:07 +00002764
wdenk2729af92004-05-03 20:45:30 +00002765 bootcmd - see CONFIG_BOOTCOMMAND
wdenkc6097192002-11-03 00:24:07 +00002766
wdenk2729af92004-05-03 20:45:30 +00002767 bootargs - Boot arguments when booting an RTOS image
wdenkc6097192002-11-03 00:24:07 +00002768
wdenk2729af92004-05-03 20:45:30 +00002769 bootfile - Name of the image to load with TFTP
wdenkc6097192002-11-03 00:24:07 +00002770
Bartlomiej Sieka7d721e32008-04-14 15:44:16 +02002771 bootm_low - Memory range available for image processing in the bootm
2772 command can be restricted. This variable is given as
2773 a hexadecimal number and defines lowest address allowed
2774 for use by the bootm command. See also "bootm_size"
2775 environment variable. Address defined by "bootm_low" is
2776 also the base of the initial memory mapping for the Linux
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002777 kernel -- see the description of CFG_BOOTMAPSZ.
Bartlomiej Sieka7d721e32008-04-14 15:44:16 +02002778
2779 bootm_size - Memory range available for image processing in the bootm
2780 command can be restricted. This variable is given as
2781 a hexadecimal number and defines the size of the region
2782 allowed for use by the bootm command. See also "bootm_low"
2783 environment variable.
2784
wdenk2729af92004-05-03 20:45:30 +00002785 autoload - if set to "no" (any string beginning with 'n'),
2786 "bootp" will just load perform a lookup of the
2787 configuration from the BOOTP server, but not try to
2788 load any image using TFTP
wdenkc6097192002-11-03 00:24:07 +00002789
Marian Balakowicz3310c542008-03-12 12:13:13 +01002790 autoscript - if set to "yes" commands like "loadb", "loady",
2791 "bootp", "tftpb", "rarpboot" and "nfs" will attempt
2792 to automatically run script images (by internally
2793 calling "autoscript").
2794
2795 autoscript_uname - if script image is in a format (FIT) this
2796 variable is used to get script subimage unit name.
2797
wdenk2729af92004-05-03 20:45:30 +00002798 autostart - if set to "yes", an image loaded using the "bootp",
2799 "rarpboot", "tftpboot" or "diskboot" commands will
2800 be automatically started (by internally calling
2801 "bootm")
wdenkc6097192002-11-03 00:24:07 +00002802
wdenk2729af92004-05-03 20:45:30 +00002803 If set to "no", a standalone image passed to the
2804 "bootm" command will be copied to the load address
2805 (and eventually uncompressed), but NOT be started.
2806 This can be used to load and uncompress arbitrary
2807 data.
wdenkc6097192002-11-03 00:24:07 +00002808
wdenk17ea1172004-06-06 21:51:03 +00002809 i2cfast - (PPC405GP|PPC405EP only)
2810 if set to 'y' configures Linux I2C driver for fast
2811 mode (400kHZ). This environment variable is used in
2812 initialization code. So, for changes to be effective
2813 it must be saved and board must be reset.
2814
wdenk2729af92004-05-03 20:45:30 +00002815 initrd_high - restrict positioning of initrd images:
2816 If this variable is not set, initrd images will be
2817 copied to the highest possible address in RAM; this
2818 is usually what you want since it allows for
2819 maximum initrd size. If for some reason you want to
2820 make sure that the initrd image is loaded below the
2821 CFG_BOOTMAPSZ limit, you can set this environment
2822 variable to a value of "no" or "off" or "0".
2823 Alternatively, you can set it to a maximum upper
2824 address to use (U-Boot will still check that it
2825 does not overwrite the U-Boot stack and data).
wdenkc6097192002-11-03 00:24:07 +00002826
wdenk2729af92004-05-03 20:45:30 +00002827 For instance, when you have a system with 16 MB
2828 RAM, and want to reserve 4 MB from use by Linux,
2829 you can do this by adding "mem=12M" to the value of
2830 the "bootargs" variable. However, now you must make
2831 sure that the initrd image is placed in the first
2832 12 MB as well - this can be done with
wdenkc6097192002-11-03 00:24:07 +00002833
wdenk2729af92004-05-03 20:45:30 +00002834 setenv initrd_high 00c00000
wdenkc6097192002-11-03 00:24:07 +00002835
wdenk2729af92004-05-03 20:45:30 +00002836 If you set initrd_high to 0xFFFFFFFF, this is an
2837 indication to U-Boot that all addresses are legal
2838 for the Linux kernel, including addresses in flash
2839 memory. In this case U-Boot will NOT COPY the
2840 ramdisk at all. This may be useful to reduce the
2841 boot time on your system, but requires that this
2842 feature is supported by your Linux kernel.
wdenk4a6fd342003-04-12 23:38:12 +00002843
wdenk2729af92004-05-03 20:45:30 +00002844 ipaddr - IP address; needed for tftpboot command
wdenkc6097192002-11-03 00:24:07 +00002845
wdenk2729af92004-05-03 20:45:30 +00002846 loadaddr - Default load address for commands like "bootp",
2847 "rarpboot", "tftpboot", "loadb" or "diskboot"
wdenkc6097192002-11-03 00:24:07 +00002848
wdenk2729af92004-05-03 20:45:30 +00002849 loads_echo - see CONFIG_LOADS_ECHO
wdenkc6097192002-11-03 00:24:07 +00002850
wdenk2729af92004-05-03 20:45:30 +00002851 serverip - TFTP server IP address; needed for tftpboot command
wdenk38b99262003-05-23 23:18:21 +00002852
wdenk2729af92004-05-03 20:45:30 +00002853 bootretry - see CONFIG_BOOT_RETRY_TIME
wdenkc6097192002-11-03 00:24:07 +00002854
wdenk2729af92004-05-03 20:45:30 +00002855 bootdelaykey - see CONFIG_AUTOBOOT_DELAY_STR
wdenkc6097192002-11-03 00:24:07 +00002856
wdenk2729af92004-05-03 20:45:30 +00002857 bootstopkey - see CONFIG_AUTOBOOT_STOP_STR
wdenkc6097192002-11-03 00:24:07 +00002858
wdenk2729af92004-05-03 20:45:30 +00002859 ethprime - When CONFIG_NET_MULTI is enabled controls which
2860 interface is used first.
wdenkc6097192002-11-03 00:24:07 +00002861
wdenk2729af92004-05-03 20:45:30 +00002862 ethact - When CONFIG_NET_MULTI is enabled controls which
2863 interface is currently active. For example you
2864 can do the following
wdenkc6097192002-11-03 00:24:07 +00002865
wdenk2729af92004-05-03 20:45:30 +00002866 => setenv ethact FEC ETHERNET
2867 => ping 192.168.0.1 # traffic sent on FEC ETHERNET
2868 => setenv ethact SCC ETHERNET
2869 => ping 10.0.0.1 # traffic sent on SCC ETHERNET
wdenkc6097192002-11-03 00:24:07 +00002870
Matthias Fuchse1692572008-01-17 07:45:05 +01002871 ethrotate - When set to "no" U-Boot does not go through all
2872 available network interfaces.
2873 It just stays at the currently selected interface.
2874
wdenk2729af92004-05-03 20:45:30 +00002875 netretry - When set to "no" each network operation will
2876 either succeed or fail without retrying.
2877 When set to "once" the network operation will
2878 fail when all the available network interfaces
2879 are tried once without success.
2880 Useful on scripts which control the retry operation
2881 themselves.
wdenkc6097192002-11-03 00:24:07 +00002882
Jean-Christophe PLAGNIOL-VILLARDa1cf0272008-01-07 08:41:34 +01002883 npe_ucode - see CONFIG_IXP4XX_NPE_EXT_UCOD
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002884 if set load address for the NPE microcode
Jean-Christophe PLAGNIOL-VILLARDa1cf0272008-01-07 08:41:34 +01002885
Wolfgang Denk28cb9372005-09-24 23:25:46 +02002886 tftpsrcport - If this is set, the value is used for TFTP's
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02002887 UDP source port.
2888
Wolfgang Denk28cb9372005-09-24 23:25:46 +02002889 tftpdstport - If this is set, the value is used for TFTP's UDP
2890 destination port instead of the Well Know Port 69.
2891
wdenk2729af92004-05-03 20:45:30 +00002892 vlan - When set to a value < 4095 the traffic over
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002893 Ethernet is encapsulated/received over 802.1q
wdenk2729af92004-05-03 20:45:30 +00002894 VLAN tagged frames.
wdenka3d991b2004-04-15 21:48:45 +00002895
wdenk2729af92004-05-03 20:45:30 +00002896The following environment variables may be used and automatically
2897updated by the network boot commands ("bootp" and "rarpboot"),
2898depending the information provided by your boot server:
wdenka3d991b2004-04-15 21:48:45 +00002899
wdenk2729af92004-05-03 20:45:30 +00002900 bootfile - see above
2901 dnsip - IP address of your Domain Name Server
2902 dnsip2 - IP address of your secondary Domain Name Server
2903 gatewayip - IP address of the Gateway (Router) to use
2904 hostname - Target hostname
2905 ipaddr - see above
2906 netmask - Subnet Mask
2907 rootpath - Pathname of the root filesystem on the NFS server
2908 serverip - see above
wdenka3d991b2004-04-15 21:48:45 +00002909
wdenka3d991b2004-04-15 21:48:45 +00002910
wdenk2729af92004-05-03 20:45:30 +00002911There are two special Environment Variables:
wdenkc6097192002-11-03 00:24:07 +00002912
wdenk2729af92004-05-03 20:45:30 +00002913 serial# - contains hardware identification information such
2914 as type string and/or serial number
2915 ethaddr - Ethernet address
wdenkc6097192002-11-03 00:24:07 +00002916
wdenk2729af92004-05-03 20:45:30 +00002917These variables can be set only once (usually during manufacturing of
2918the board). U-Boot refuses to delete or overwrite these variables
2919once they have been set once.
wdenkc6097192002-11-03 00:24:07 +00002920
2921
wdenk2729af92004-05-03 20:45:30 +00002922Further special Environment Variables:
wdenkc6097192002-11-03 00:24:07 +00002923
wdenk2729af92004-05-03 20:45:30 +00002924 ver - Contains the U-Boot version string as printed
2925 with the "version" command. This variable is
2926 readonly (see CONFIG_VERSION_VARIABLE).
wdenkc6097192002-11-03 00:24:07 +00002927
wdenkc6097192002-11-03 00:24:07 +00002928
wdenk2729af92004-05-03 20:45:30 +00002929Please note that changes to some configuration parameters may take
2930only effect after the next boot (yes, that's just like Windoze :-).
wdenkc6097192002-11-03 00:24:07 +00002931
stroesec1551ea2003-04-04 15:53:41 +00002932
wdenk2729af92004-05-03 20:45:30 +00002933Command Line Parsing:
2934=====================
stroesec1551ea2003-04-04 15:53:41 +00002935
wdenk2729af92004-05-03 20:45:30 +00002936There are two different command line parsers available with U-Boot:
2937the old "simple" one, and the much more powerful "hush" shell:
stroesec1551ea2003-04-04 15:53:41 +00002938
wdenk2729af92004-05-03 20:45:30 +00002939Old, simple command line parser:
2940--------------------------------
wdenkc6097192002-11-03 00:24:07 +00002941
wdenk2729af92004-05-03 20:45:30 +00002942- supports environment variables (through setenv / saveenv commands)
2943- several commands on one line, separated by ';'
Wolfgang Denkfe126d82005-11-20 21:40:11 +01002944- variable substitution using "... ${name} ..." syntax
wdenk2729af92004-05-03 20:45:30 +00002945- special characters ('$', ';') can be escaped by prefixing with '\',
2946 for example:
Wolfgang Denkfe126d82005-11-20 21:40:11 +01002947 setenv bootcmd bootm \${address}
wdenk2729af92004-05-03 20:45:30 +00002948- You can also escape text by enclosing in single apostrophes, for example:
2949 setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
wdenkc6097192002-11-03 00:24:07 +00002950
wdenk2729af92004-05-03 20:45:30 +00002951Hush shell:
2952-----------
wdenkf07771c2003-05-28 08:06:31 +00002953
wdenk2729af92004-05-03 20:45:30 +00002954- similar to Bourne shell, with control structures like
2955 if...then...else...fi, for...do...done; while...do...done,
2956 until...do...done, ...
2957- supports environment ("global") variables (through setenv / saveenv
2958 commands) and local shell variables (through standard shell syntax
2959 "name=value"); only environment variables can be used with "run"
2960 command
wdenkf07771c2003-05-28 08:06:31 +00002961
wdenk2729af92004-05-03 20:45:30 +00002962General rules:
2963--------------
wdenkf07771c2003-05-28 08:06:31 +00002964
wdenk2729af92004-05-03 20:45:30 +00002965(1) If a command line (or an environment variable executed by a "run"
2966 command) contains several commands separated by semicolon, and
2967 one of these commands fails, then the remaining commands will be
2968 executed anyway.
wdenkf07771c2003-05-28 08:06:31 +00002969
wdenk2729af92004-05-03 20:45:30 +00002970(2) If you execute several variables with one call to run (i. e.
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002971 calling run with a list of variables as arguments), any failing
wdenk2729af92004-05-03 20:45:30 +00002972 command will cause "run" to terminate, i. e. the remaining
2973 variables are not executed.
wdenkf07771c2003-05-28 08:06:31 +00002974
wdenk2729af92004-05-03 20:45:30 +00002975Note for Redundant Ethernet Interfaces:
2976=======================================
wdenkf07771c2003-05-28 08:06:31 +00002977
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002978Some boards come with redundant Ethernet interfaces; U-Boot supports
wdenk2729af92004-05-03 20:45:30 +00002979such configurations and is capable of automatic selection of a
2980"working" interface when needed. MAC assignment works as follows:
wdenkf07771c2003-05-28 08:06:31 +00002981
wdenk2729af92004-05-03 20:45:30 +00002982Network interfaces are numbered eth0, eth1, eth2, ... Corresponding
2983MAC addresses can be stored in the environment as "ethaddr" (=>eth0),
2984"eth1addr" (=>eth1), "eth2addr", ...
wdenkf07771c2003-05-28 08:06:31 +00002985
wdenk2729af92004-05-03 20:45:30 +00002986If the network interface stores some valid MAC address (for instance
2987in SROM), this is used as default address if there is NO correspon-
2988ding setting in the environment; if the corresponding environment
2989variable is set, this overrides the settings in the card; that means:
wdenkf07771c2003-05-28 08:06:31 +00002990
wdenk2729af92004-05-03 20:45:30 +00002991o If the SROM has a valid MAC address, and there is no address in the
2992 environment, the SROM's address is used.
wdenkc6097192002-11-03 00:24:07 +00002993
wdenk2729af92004-05-03 20:45:30 +00002994o If there is no valid address in the SROM, and a definition in the
2995 environment exists, then the value from the environment variable is
2996 used.
wdenkc6097192002-11-03 00:24:07 +00002997
wdenk2729af92004-05-03 20:45:30 +00002998o If both the SROM and the environment contain a MAC address, and
2999 both addresses are the same, this MAC address is used.
wdenkc6097192002-11-03 00:24:07 +00003000
wdenk2729af92004-05-03 20:45:30 +00003001o If both the SROM and the environment contain a MAC address, and the
3002 addresses differ, the value from the environment is used and a
3003 warning is printed.
wdenkc6097192002-11-03 00:24:07 +00003004
wdenk2729af92004-05-03 20:45:30 +00003005o If neither SROM nor the environment contain a MAC address, an error
3006 is raised.
wdenkc6097192002-11-03 00:24:07 +00003007
wdenkc6097192002-11-03 00:24:07 +00003008
wdenk2729af92004-05-03 20:45:30 +00003009Image Formats:
3010==============
wdenkc6097192002-11-03 00:24:07 +00003011
Marian Balakowicz3310c542008-03-12 12:13:13 +01003012U-Boot is capable of booting (and performing other auxiliary operations on)
3013images in two formats:
3014
3015New uImage format (FIT)
3016-----------------------
3017
3018Flexible and powerful format based on Flattened Image Tree -- FIT (similar
3019to Flattened Device Tree). It allows the use of images with multiple
3020components (several kernels, ramdisks, etc.), with contents protected by
3021SHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
3022
3023
3024Old uImage format
3025-----------------
3026
3027Old image format is based on binary files which can be basically anything,
3028preceded by a special header; see the definitions in include/image.h for
3029details; basically, the header defines the following image properties:
wdenkc6097192002-11-03 00:24:07 +00003030
wdenk2729af92004-05-03 20:45:30 +00003031* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
3032 4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
3033 LynxOS, pSOS, QNX, RTEMS, ARTOS;
3034 Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, ARTOS, LynxOS).
Wolfgang Denk7b64fef2006-10-24 14:21:16 +02003035* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
wdenk2729af92004-05-03 20:45:30 +00003036 IA64, MIPS, NIOS, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
Wolfgang Denk7b64fef2006-10-24 14:21:16 +02003037 Currently supported: ARM, AVR32, Intel x86, MIPS, NIOS, PowerPC).
wdenk2729af92004-05-03 20:45:30 +00003038* Compression Type (uncompressed, gzip, bzip2)
3039* Load Address
3040* Entry Point
3041* Image Name
3042* Image Timestamp
wdenkc6097192002-11-03 00:24:07 +00003043
wdenk2729af92004-05-03 20:45:30 +00003044The header is marked by a special Magic Number, and both the header
3045and the data portions of the image are secured against corruption by
3046CRC32 checksums.
wdenkc6097192002-11-03 00:24:07 +00003047
wdenkc6097192002-11-03 00:24:07 +00003048
wdenk2729af92004-05-03 20:45:30 +00003049Linux Support:
3050==============
wdenkc6097192002-11-03 00:24:07 +00003051
wdenk2729af92004-05-03 20:45:30 +00003052Although U-Boot should support any OS or standalone application
3053easily, the main focus has always been on Linux during the design of
3054U-Boot.
wdenkc6097192002-11-03 00:24:07 +00003055
wdenk2729af92004-05-03 20:45:30 +00003056U-Boot includes many features that so far have been part of some
3057special "boot loader" code within the Linux kernel. Also, any
3058"initrd" images to be used are no longer part of one big Linux image;
3059instead, kernel and "initrd" are separate images. This implementation
3060serves several purposes:
wdenkc6097192002-11-03 00:24:07 +00003061
wdenk2729af92004-05-03 20:45:30 +00003062- the same features can be used for other OS or standalone
3063 applications (for instance: using compressed images to reduce the
3064 Flash memory footprint)
wdenkc6097192002-11-03 00:24:07 +00003065
wdenk2729af92004-05-03 20:45:30 +00003066- it becomes much easier to port new Linux kernel versions because
3067 lots of low-level, hardware dependent stuff are done by U-Boot
wdenkc6097192002-11-03 00:24:07 +00003068
wdenk2729af92004-05-03 20:45:30 +00003069- the same Linux kernel image can now be used with different "initrd"
3070 images; of course this also means that different kernel images can
3071 be run with the same "initrd". This makes testing easier (you don't
3072 have to build a new "zImage.initrd" Linux image when you just
3073 change a file in your "initrd"). Also, a field-upgrade of the
3074 software is easier now.
wdenkc6097192002-11-03 00:24:07 +00003075
wdenkc6097192002-11-03 00:24:07 +00003076
wdenk2729af92004-05-03 20:45:30 +00003077Linux HOWTO:
3078============
wdenkc6097192002-11-03 00:24:07 +00003079
wdenk2729af92004-05-03 20:45:30 +00003080Porting Linux to U-Boot based systems:
3081---------------------------------------
wdenkc6097192002-11-03 00:24:07 +00003082
wdenk2729af92004-05-03 20:45:30 +00003083U-Boot cannot save you from doing all the necessary modifications to
3084configure the Linux device drivers for use with your target hardware
3085(no, we don't intend to provide a full virtual machine interface to
3086Linux :-).
wdenkc6097192002-11-03 00:24:07 +00003087
wdenk2729af92004-05-03 20:45:30 +00003088But now you can ignore ALL boot loader code (in arch/ppc/mbxboot).
wdenkc6097192002-11-03 00:24:07 +00003089
wdenk2729af92004-05-03 20:45:30 +00003090Just make sure your machine specific header file (for instance
3091include/asm-ppc/tqm8xx.h) includes the same definition of the Board
3092Information structure as we define in include/u-boot.h, and make
3093sure that your definition of IMAP_ADDR uses the same value as your
3094U-Boot configuration in CFG_IMMR.
wdenkc6097192002-11-03 00:24:07 +00003095
wdenkc6097192002-11-03 00:24:07 +00003096
wdenk2729af92004-05-03 20:45:30 +00003097Configuring the Linux kernel:
3098-----------------------------
wdenkc6097192002-11-03 00:24:07 +00003099
wdenk2729af92004-05-03 20:45:30 +00003100No specific requirements for U-Boot. Make sure you have some root
3101device (initial ramdisk, NFS) for your target system.
wdenkc6097192002-11-03 00:24:07 +00003102
wdenkc6097192002-11-03 00:24:07 +00003103
wdenk2729af92004-05-03 20:45:30 +00003104Building a Linux Image:
3105-----------------------
wdenkc6097192002-11-03 00:24:07 +00003106
wdenk2729af92004-05-03 20:45:30 +00003107With U-Boot, "normal" build targets like "zImage" or "bzImage" are
3108not used. If you use recent kernel source, a new build target
3109"uImage" will exist which automatically builds an image usable by
3110U-Boot. Most older kernels also have support for a "pImage" target,
3111which was introduced for our predecessor project PPCBoot and uses a
3112100% compatible format.
wdenkc6097192002-11-03 00:24:07 +00003113
wdenk2729af92004-05-03 20:45:30 +00003114Example:
wdenkc6097192002-11-03 00:24:07 +00003115
wdenk2729af92004-05-03 20:45:30 +00003116 make TQM850L_config
3117 make oldconfig
3118 make dep
3119 make uImage
wdenkc6097192002-11-03 00:24:07 +00003120
wdenk2729af92004-05-03 20:45:30 +00003121The "uImage" build target uses a special tool (in 'tools/mkimage') to
3122encapsulate a compressed Linux kernel image with header information,
3123CRC32 checksum etc. for use with U-Boot. This is what we are doing:
wdenkc6097192002-11-03 00:24:07 +00003124
wdenk2729af92004-05-03 20:45:30 +00003125* build a standard "vmlinux" kernel image (in ELF binary format):
wdenkc6097192002-11-03 00:24:07 +00003126
wdenk2729af92004-05-03 20:45:30 +00003127* convert the kernel into a raw binary image:
wdenkc6097192002-11-03 00:24:07 +00003128
wdenk2729af92004-05-03 20:45:30 +00003129 ${CROSS_COMPILE}-objcopy -O binary \
3130 -R .note -R .comment \
3131 -S vmlinux linux.bin
wdenkc6097192002-11-03 00:24:07 +00003132
wdenk2729af92004-05-03 20:45:30 +00003133* compress the binary image:
wdenkc6097192002-11-03 00:24:07 +00003134
wdenk2729af92004-05-03 20:45:30 +00003135 gzip -9 linux.bin
wdenkc6097192002-11-03 00:24:07 +00003136
wdenk2729af92004-05-03 20:45:30 +00003137* package compressed binary image for U-Boot:
wdenk24ee89b2002-11-03 17:56:27 +00003138
wdenk2729af92004-05-03 20:45:30 +00003139 mkimage -A ppc -O linux -T kernel -C gzip \
3140 -a 0 -e 0 -n "Linux Kernel Image" \
3141 -d linux.bin.gz uImage
wdenk24ee89b2002-11-03 17:56:27 +00003142
wdenk24ee89b2002-11-03 17:56:27 +00003143
wdenk2729af92004-05-03 20:45:30 +00003144The "mkimage" tool can also be used to create ramdisk images for use
3145with U-Boot, either separated from the Linux kernel image, or
3146combined into one file. "mkimage" encapsulates the images with a 64
3147byte header containing information about target architecture,
3148operating system, image type, compression method, entry points, time
3149stamp, CRC32 checksums, etc.
wdenk24ee89b2002-11-03 17:56:27 +00003150
wdenk2729af92004-05-03 20:45:30 +00003151"mkimage" can be called in two ways: to verify existing images and
3152print the header information, or to build new images.
wdenk24ee89b2002-11-03 17:56:27 +00003153
wdenk2729af92004-05-03 20:45:30 +00003154In the first form (with "-l" option) mkimage lists the information
3155contained in the header of an existing U-Boot image; this includes
3156checksum verification:
wdenk24ee89b2002-11-03 17:56:27 +00003157
wdenk2729af92004-05-03 20:45:30 +00003158 tools/mkimage -l image
3159 -l ==> list image header information
wdenk24ee89b2002-11-03 17:56:27 +00003160
wdenk2729af92004-05-03 20:45:30 +00003161The second form (with "-d" option) is used to build a U-Boot image
3162from a "data file" which is used as image payload:
wdenk24ee89b2002-11-03 17:56:27 +00003163
wdenk2729af92004-05-03 20:45:30 +00003164 tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
3165 -n name -d data_file image
3166 -A ==> set architecture to 'arch'
3167 -O ==> set operating system to 'os'
3168 -T ==> set image type to 'type'
3169 -C ==> set compression type 'comp'
3170 -a ==> set load address to 'addr' (hex)
3171 -e ==> set entry point to 'ep' (hex)
3172 -n ==> set image name to 'name'
3173 -d ==> use image data from 'datafile'
wdenk24ee89b2002-11-03 17:56:27 +00003174
wdenk69459792004-05-29 16:53:29 +00003175Right now, all Linux kernels for PowerPC systems use the same load
3176address (0x00000000), but the entry point address depends on the
3177kernel version:
wdenkc6097192002-11-03 00:24:07 +00003178
wdenk2729af92004-05-03 20:45:30 +00003179- 2.2.x kernels have the entry point at 0x0000000C,
3180- 2.3.x and later kernels have the entry point at 0x00000000.
wdenkc6097192002-11-03 00:24:07 +00003181
wdenk2729af92004-05-03 20:45:30 +00003182So a typical call to build a U-Boot image would read:
wdenkc6097192002-11-03 00:24:07 +00003183
wdenk2729af92004-05-03 20:45:30 +00003184 -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
3185 > -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
3186 > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz \
3187 > examples/uImage.TQM850L
3188 Image Name: 2.4.4 kernel for TQM850L
3189 Created: Wed Jul 19 02:34:59 2000
3190 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3191 Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
3192 Load Address: 0x00000000
3193 Entry Point: 0x00000000
wdenkc6097192002-11-03 00:24:07 +00003194
wdenk2729af92004-05-03 20:45:30 +00003195To verify the contents of the image (or check for corruption):
wdenkc6097192002-11-03 00:24:07 +00003196
wdenk2729af92004-05-03 20:45:30 +00003197 -> tools/mkimage -l examples/uImage.TQM850L
3198 Image Name: 2.4.4 kernel for TQM850L
3199 Created: Wed Jul 19 02:34:59 2000
3200 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3201 Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
3202 Load Address: 0x00000000
3203 Entry Point: 0x00000000
wdenkc6097192002-11-03 00:24:07 +00003204
wdenk2729af92004-05-03 20:45:30 +00003205NOTE: for embedded systems where boot time is critical you can trade
3206speed for memory and install an UNCOMPRESSED image instead: this
3207needs more space in Flash, but boots much faster since it does not
3208need to be uncompressed:
wdenkc6097192002-11-03 00:24:07 +00003209
wdenk2729af92004-05-03 20:45:30 +00003210 -> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz
3211 -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
3212 > -A ppc -O linux -T kernel -C none -a 0 -e 0 \
3213 > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux \
3214 > examples/uImage.TQM850L-uncompressed
3215 Image Name: 2.4.4 kernel for TQM850L
3216 Created: Wed Jul 19 02:34:59 2000
3217 Image Type: PowerPC Linux Kernel Image (uncompressed)
3218 Data Size: 792160 Bytes = 773.59 kB = 0.76 MB
3219 Load Address: 0x00000000
3220 Entry Point: 0x00000000
wdenkc6097192002-11-03 00:24:07 +00003221
wdenkc6097192002-11-03 00:24:07 +00003222
wdenk2729af92004-05-03 20:45:30 +00003223Similar you can build U-Boot images from a 'ramdisk.image.gz' file
3224when your kernel is intended to use an initial ramdisk:
wdenkdb01a2e2004-04-15 23:14:49 +00003225
wdenk2729af92004-05-03 20:45:30 +00003226 -> tools/mkimage -n 'Simple Ramdisk Image' \
3227 > -A ppc -O linux -T ramdisk -C gzip \
3228 > -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
3229 Image Name: Simple Ramdisk Image
3230 Created: Wed Jan 12 14:01:50 2000
3231 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
3232 Data Size: 566530 Bytes = 553.25 kB = 0.54 MB
3233 Load Address: 0x00000000
3234 Entry Point: 0x00000000
wdenkdb01a2e2004-04-15 23:14:49 +00003235
wdenkdb01a2e2004-04-15 23:14:49 +00003236
wdenk2729af92004-05-03 20:45:30 +00003237Installing a Linux Image:
3238-------------------------
wdenkdb01a2e2004-04-15 23:14:49 +00003239
wdenk2729af92004-05-03 20:45:30 +00003240To downloading a U-Boot image over the serial (console) interface,
3241you must convert the image to S-Record format:
wdenkdb01a2e2004-04-15 23:14:49 +00003242
wdenk2729af92004-05-03 20:45:30 +00003243 objcopy -I binary -O srec examples/image examples/image.srec
wdenkdb01a2e2004-04-15 23:14:49 +00003244
wdenk2729af92004-05-03 20:45:30 +00003245The 'objcopy' does not understand the information in the U-Boot
3246image header, so the resulting S-Record file will be relative to
3247address 0x00000000. To load it to a given address, you need to
3248specify the target address as 'offset' parameter with the 'loads'
3249command.
wdenkc6097192002-11-03 00:24:07 +00003250
wdenk2729af92004-05-03 20:45:30 +00003251Example: install the image to address 0x40100000 (which on the
3252TQM8xxL is in the first Flash bank):
wdenkc6097192002-11-03 00:24:07 +00003253
wdenk2729af92004-05-03 20:45:30 +00003254 => erase 40100000 401FFFFF
wdenkc6097192002-11-03 00:24:07 +00003255
wdenk2729af92004-05-03 20:45:30 +00003256 .......... done
3257 Erased 8 sectors
wdenkc6097192002-11-03 00:24:07 +00003258
wdenk2729af92004-05-03 20:45:30 +00003259 => loads 40100000
3260 ## Ready for S-Record download ...
3261 ~>examples/image.srec
3262 1 2 3 4 5 6 7 8 9 10 11 12 13 ...
3263 ...
3264 15989 15990 15991 15992
3265 [file transfer complete]
3266 [connected]
3267 ## Start Addr = 0x00000000
wdenkc6097192002-11-03 00:24:07 +00003268
3269
wdenk2729af92004-05-03 20:45:30 +00003270You can check the success of the download using the 'iminfo' command;
Wolfgang Denk218ca722008-03-26 10:40:12 +01003271this includes a checksum verification so you can be sure no data
wdenk2729af92004-05-03 20:45:30 +00003272corruption happened:
wdenkc6097192002-11-03 00:24:07 +00003273
wdenk2729af92004-05-03 20:45:30 +00003274 => imi 40100000
wdenkc6097192002-11-03 00:24:07 +00003275
wdenk2729af92004-05-03 20:45:30 +00003276 ## Checking Image at 40100000 ...
3277 Image Name: 2.2.13 for initrd on TQM850L
3278 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3279 Data Size: 335725 Bytes = 327 kB = 0 MB
3280 Load Address: 00000000
3281 Entry Point: 0000000c
3282 Verifying Checksum ... OK
wdenkc6097192002-11-03 00:24:07 +00003283
3284
wdenk2729af92004-05-03 20:45:30 +00003285Boot Linux:
3286-----------
wdenkc6097192002-11-03 00:24:07 +00003287
wdenk2729af92004-05-03 20:45:30 +00003288The "bootm" command is used to boot an application that is stored in
3289memory (RAM or Flash). In case of a Linux kernel image, the contents
3290of the "bootargs" environment variable is passed to the kernel as
3291parameters. You can check and modify this variable using the
3292"printenv" and "setenv" commands:
wdenkc6097192002-11-03 00:24:07 +00003293
3294
wdenk2729af92004-05-03 20:45:30 +00003295 => printenv bootargs
3296 bootargs=root=/dev/ram
wdenkc6097192002-11-03 00:24:07 +00003297
wdenk2729af92004-05-03 20:45:30 +00003298 => setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
wdenkc6097192002-11-03 00:24:07 +00003299
wdenk2729af92004-05-03 20:45:30 +00003300 => printenv bootargs
3301 bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
wdenkc6097192002-11-03 00:24:07 +00003302
wdenk2729af92004-05-03 20:45:30 +00003303 => bootm 40020000
3304 ## Booting Linux kernel at 40020000 ...
3305 Image Name: 2.2.13 for NFS on TQM850L
3306 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3307 Data Size: 381681 Bytes = 372 kB = 0 MB
3308 Load Address: 00000000
3309 Entry Point: 0000000c
3310 Verifying Checksum ... OK
3311 Uncompressing Kernel Image ... OK
3312 Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:35:17 MEST 2000
3313 Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
3314 time_init: decrementer frequency = 187500000/60
3315 Calibrating delay loop... 49.77 BogoMIPS
3316 Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
3317 ...
wdenkc6097192002-11-03 00:24:07 +00003318
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003319If you want to boot a Linux kernel with initial RAM disk, you pass
wdenk2729af92004-05-03 20:45:30 +00003320the memory addresses of both the kernel and the initrd image (PPBCOOT
3321format!) to the "bootm" command:
wdenkc6097192002-11-03 00:24:07 +00003322
wdenk2729af92004-05-03 20:45:30 +00003323 => imi 40100000 40200000
wdenkc6097192002-11-03 00:24:07 +00003324
wdenk2729af92004-05-03 20:45:30 +00003325 ## Checking Image at 40100000 ...
3326 Image Name: 2.2.13 for initrd on TQM850L
3327 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3328 Data Size: 335725 Bytes = 327 kB = 0 MB
3329 Load Address: 00000000
3330 Entry Point: 0000000c
3331 Verifying Checksum ... OK
wdenkc6097192002-11-03 00:24:07 +00003332
wdenk2729af92004-05-03 20:45:30 +00003333 ## Checking Image at 40200000 ...
3334 Image Name: Simple Ramdisk Image
3335 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
3336 Data Size: 566530 Bytes = 553 kB = 0 MB
3337 Load Address: 00000000
3338 Entry Point: 00000000
3339 Verifying Checksum ... OK
wdenkc6097192002-11-03 00:24:07 +00003340
wdenk2729af92004-05-03 20:45:30 +00003341 => bootm 40100000 40200000
3342 ## Booting Linux kernel at 40100000 ...
3343 Image Name: 2.2.13 for initrd on TQM850L
3344 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3345 Data Size: 335725 Bytes = 327 kB = 0 MB
3346 Load Address: 00000000
3347 Entry Point: 0000000c
3348 Verifying Checksum ... OK
3349 Uncompressing Kernel Image ... OK
3350 ## Loading RAMDisk Image at 40200000 ...
3351 Image Name: Simple Ramdisk Image
3352 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
3353 Data Size: 566530 Bytes = 553 kB = 0 MB
3354 Load Address: 00000000
3355 Entry Point: 00000000
3356 Verifying Checksum ... OK
3357 Loading Ramdisk ... OK
3358 Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:32:08 MEST 2000
3359 Boot arguments: root=/dev/ram
3360 time_init: decrementer frequency = 187500000/60
3361 Calibrating delay loop... 49.77 BogoMIPS
3362 ...
3363 RAMDISK: Compressed image found at block 0
3364 VFS: Mounted root (ext2 filesystem).
wdenkc6097192002-11-03 00:24:07 +00003365
wdenk2729af92004-05-03 20:45:30 +00003366 bash#
wdenkc6097192002-11-03 00:24:07 +00003367
Matthew McClintock02677682006-06-28 10:41:37 -05003368Boot Linux and pass a flat device tree:
3369-----------
3370
3371First, U-Boot must be compiled with the appropriate defines. See the section
3372titled "Linux Kernel Interface" above for a more in depth explanation. The
3373following is an example of how to start a kernel and pass an updated
3374flat device tree:
3375
3376=> print oftaddr
3377oftaddr=0x300000
3378=> print oft
3379oft=oftrees/mpc8540ads.dtb
3380=> tftp $oftaddr $oft
3381Speed: 1000, full duplex
3382Using TSEC0 device
3383TFTP from server 192.168.1.1; our IP address is 192.168.1.101
3384Filename 'oftrees/mpc8540ads.dtb'.
3385Load address: 0x300000
3386Loading: #
3387done
3388Bytes transferred = 4106 (100a hex)
3389=> tftp $loadaddr $bootfile
3390Speed: 1000, full duplex
3391Using TSEC0 device
3392TFTP from server 192.168.1.1; our IP address is 192.168.1.2
3393Filename 'uImage'.
3394Load address: 0x200000
3395Loading:############
3396done
3397Bytes transferred = 1029407 (fb51f hex)
3398=> print loadaddr
3399loadaddr=200000
3400=> print oftaddr
3401oftaddr=0x300000
3402=> bootm $loadaddr - $oftaddr
3403## Booting image at 00200000 ...
Wolfgang Denka9398e02006-11-27 15:32:42 +01003404 Image Name: Linux-2.6.17-dirty
3405 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3406 Data Size: 1029343 Bytes = 1005.2 kB
Matthew McClintock02677682006-06-28 10:41:37 -05003407 Load Address: 00000000
Wolfgang Denka9398e02006-11-27 15:32:42 +01003408 Entry Point: 00000000
Matthew McClintock02677682006-06-28 10:41:37 -05003409 Verifying Checksum ... OK
3410 Uncompressing Kernel Image ... OK
3411Booting using flat device tree at 0x300000
3412Using MPC85xx ADS machine description
3413Memory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
3414[snip]
3415
3416
wdenk2729af92004-05-03 20:45:30 +00003417More About U-Boot Image Types:
3418------------------------------
wdenk6069ff22003-02-28 00:49:47 +00003419
wdenk2729af92004-05-03 20:45:30 +00003420U-Boot supports the following image types:
wdenk6069ff22003-02-28 00:49:47 +00003421
wdenk2729af92004-05-03 20:45:30 +00003422 "Standalone Programs" are directly runnable in the environment
3423 provided by U-Boot; it is expected that (if they behave
3424 well) you can continue to work in U-Boot after return from
3425 the Standalone Program.
3426 "OS Kernel Images" are usually images of some Embedded OS which
3427 will take over control completely. Usually these programs
3428 will install their own set of exception handlers, device
3429 drivers, set up the MMU, etc. - this means, that you cannot
3430 expect to re-enter U-Boot except by resetting the CPU.
3431 "RAMDisk Images" are more or less just data blocks, and their
3432 parameters (address, size) are passed to an OS kernel that is
3433 being started.
3434 "Multi-File Images" contain several images, typically an OS
3435 (Linux) kernel image and one or more data images like
3436 RAMDisks. This construct is useful for instance when you want
3437 to boot over the network using BOOTP etc., where the boot
3438 server provides just a single image file, but you want to get
3439 for instance an OS kernel and a RAMDisk image.
stroesec1551ea2003-04-04 15:53:41 +00003440
wdenk2729af92004-05-03 20:45:30 +00003441 "Multi-File Images" start with a list of image sizes, each
3442 image size (in bytes) specified by an "uint32_t" in network
3443 byte order. This list is terminated by an "(uint32_t)0".
3444 Immediately after the terminating 0 follow the images, one by
3445 one, all aligned on "uint32_t" boundaries (size rounded up to
3446 a multiple of 4 bytes).
stroesec1551ea2003-04-04 15:53:41 +00003447
wdenk2729af92004-05-03 20:45:30 +00003448 "Firmware Images" are binary images containing firmware (like
3449 U-Boot or FPGA images) which usually will be programmed to
3450 flash memory.
stroesec1551ea2003-04-04 15:53:41 +00003451
wdenk2729af92004-05-03 20:45:30 +00003452 "Script files" are command sequences that will be executed by
3453 U-Boot's command interpreter; this feature is especially
3454 useful when you configure U-Boot to use a real shell (hush)
3455 as command interpreter.
wdenk6069ff22003-02-28 00:49:47 +00003456
wdenkc6097192002-11-03 00:24:07 +00003457
wdenk2729af92004-05-03 20:45:30 +00003458Standalone HOWTO:
3459=================
wdenkc6097192002-11-03 00:24:07 +00003460
wdenk2729af92004-05-03 20:45:30 +00003461One of the features of U-Boot is that you can dynamically load and
3462run "standalone" applications, which can use some resources of
3463U-Boot like console I/O functions or interrupt services.
wdenkc6097192002-11-03 00:24:07 +00003464
wdenk2729af92004-05-03 20:45:30 +00003465Two simple examples are included with the sources:
wdenkc6097192002-11-03 00:24:07 +00003466
wdenk2729af92004-05-03 20:45:30 +00003467"Hello World" Demo:
3468-------------------
wdenkc6097192002-11-03 00:24:07 +00003469
wdenk2729af92004-05-03 20:45:30 +00003470'examples/hello_world.c' contains a small "Hello World" Demo
3471application; it is automatically compiled when you build U-Boot.
3472It's configured to run at address 0x00040004, so you can play with it
3473like that:
wdenkc6097192002-11-03 00:24:07 +00003474
wdenk2729af92004-05-03 20:45:30 +00003475 => loads
3476 ## Ready for S-Record download ...
3477 ~>examples/hello_world.srec
3478 1 2 3 4 5 6 7 8 9 10 11 ...
3479 [file transfer complete]
3480 [connected]
3481 ## Start Addr = 0x00040004
wdenkc6097192002-11-03 00:24:07 +00003482
wdenk2729af92004-05-03 20:45:30 +00003483 => go 40004 Hello World! This is a test.
3484 ## Starting application at 0x00040004 ...
3485 Hello World
3486 argc = 7
3487 argv[0] = "40004"
3488 argv[1] = "Hello"
3489 argv[2] = "World!"
3490 argv[3] = "This"
3491 argv[4] = "is"
3492 argv[5] = "a"
3493 argv[6] = "test."
3494 argv[7] = "<NULL>"
3495 Hit any key to exit ...
wdenkc6097192002-11-03 00:24:07 +00003496
wdenk2729af92004-05-03 20:45:30 +00003497 ## Application terminated, rc = 0x0
wdenkc6097192002-11-03 00:24:07 +00003498
wdenk2729af92004-05-03 20:45:30 +00003499Another example, which demonstrates how to register a CPM interrupt
3500handler with the U-Boot code, can be found in 'examples/timer.c'.
3501Here, a CPM timer is set up to generate an interrupt every second.
3502The interrupt service routine is trivial, just printing a '.'
3503character, but this is just a demo program. The application can be
3504controlled by the following keys:
wdenkc6097192002-11-03 00:24:07 +00003505
wdenk2729af92004-05-03 20:45:30 +00003506 ? - print current values og the CPM Timer registers
3507 b - enable interrupts and start timer
3508 e - stop timer and disable interrupts
3509 q - quit application
wdenkc6097192002-11-03 00:24:07 +00003510
wdenk2729af92004-05-03 20:45:30 +00003511 => loads
3512 ## Ready for S-Record download ...
3513 ~>examples/timer.srec
3514 1 2 3 4 5 6 7 8 9 10 11 ...
3515 [file transfer complete]
3516 [connected]
3517 ## Start Addr = 0x00040004
wdenkc6097192002-11-03 00:24:07 +00003518
wdenk2729af92004-05-03 20:45:30 +00003519 => go 40004
3520 ## Starting application at 0x00040004 ...
3521 TIMERS=0xfff00980
3522 Using timer 1
3523 tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
wdenkc6097192002-11-03 00:24:07 +00003524
wdenk2729af92004-05-03 20:45:30 +00003525Hit 'b':
3526 [q, b, e, ?] Set interval 1000000 us
3527 Enabling timer
3528Hit '?':
3529 [q, b, e, ?] ........
3530 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
3531Hit '?':
3532 [q, b, e, ?] .
3533 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
3534Hit '?':
3535 [q, b, e, ?] .
3536 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
3537Hit '?':
3538 [q, b, e, ?] .
3539 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
3540Hit 'e':
3541 [q, b, e, ?] ...Stopping timer
3542Hit 'q':
3543 [q, b, e, ?] ## Application terminated, rc = 0x0
wdenkc6097192002-11-03 00:24:07 +00003544
3545
wdenk2729af92004-05-03 20:45:30 +00003546Minicom warning:
3547================
wdenk85ec0bc2003-03-31 16:34:49 +00003548
wdenk2729af92004-05-03 20:45:30 +00003549Over time, many people have reported problems when trying to use the
3550"minicom" terminal emulation program for serial download. I (wd)
3551consider minicom to be broken, and recommend not to use it. Under
3552Unix, I recommend to use C-Kermit for general purpose use (and
3553especially for kermit binary protocol download ("loadb" command), and
3554use "cu" for S-Record download ("loads" command).
wdenk85ec0bc2003-03-31 16:34:49 +00003555
wdenk2729af92004-05-03 20:45:30 +00003556Nevertheless, if you absolutely want to use it try adding this
3557configuration to your "File transfer protocols" section:
wdenk52f52c12003-06-19 23:04:19 +00003558
wdenk2729af92004-05-03 20:45:30 +00003559 Name Program Name U/D FullScr IO-Red. Multi
3560 X kermit /usr/bin/kermit -i -l %l -s Y U Y N N
3561 Y kermit /usr/bin/kermit -i -l %l -r N D Y N N
wdenk52f52c12003-06-19 23:04:19 +00003562
3563
wdenk2729af92004-05-03 20:45:30 +00003564NetBSD Notes:
3565=============
wdenkc6097192002-11-03 00:24:07 +00003566
wdenk2729af92004-05-03 20:45:30 +00003567Starting at version 0.9.2, U-Boot supports NetBSD both as host
3568(build U-Boot) and target system (boots NetBSD/mpc8xx).
wdenkc6097192002-11-03 00:24:07 +00003569
wdenk2729af92004-05-03 20:45:30 +00003570Building requires a cross environment; it is known to work on
3571NetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
3572need gmake since the Makefiles are not compatible with BSD make).
3573Note that the cross-powerpc package does not install include files;
3574attempting to build U-Boot will fail because <machine/ansi.h> is
3575missing. This file has to be installed and patched manually:
wdenkc6097192002-11-03 00:24:07 +00003576
wdenk2729af92004-05-03 20:45:30 +00003577 # cd /usr/pkg/cross/powerpc-netbsd/include
3578 # mkdir powerpc
3579 # ln -s powerpc machine
3580 # cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
3581 # ${EDIT} powerpc/ansi.h ## must remove __va_list, _BSD_VA_LIST
wdenkc6097192002-11-03 00:24:07 +00003582
wdenk2729af92004-05-03 20:45:30 +00003583Native builds *don't* work due to incompatibilities between native
3584and U-Boot include files.
wdenkc6097192002-11-03 00:24:07 +00003585
wdenk2729af92004-05-03 20:45:30 +00003586Booting assumes that (the first part of) the image booted is a
3587stage-2 loader which in turn loads and then invokes the kernel
3588proper. Loader sources will eventually appear in the NetBSD source
3589tree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
wdenk2a8af182005-04-13 10:02:42 +00003590meantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
wdenkc6097192002-11-03 00:24:07 +00003591
3592
wdenk2729af92004-05-03 20:45:30 +00003593Implementation Internals:
3594=========================
wdenkc6097192002-11-03 00:24:07 +00003595
wdenk2729af92004-05-03 20:45:30 +00003596The following is not intended to be a complete description of every
3597implementation detail. However, it should help to understand the
3598inner workings of U-Boot and make it easier to port it to custom
3599hardware.
wdenkc6097192002-11-03 00:24:07 +00003600
3601
wdenk2729af92004-05-03 20:45:30 +00003602Initial Stack, Global Data:
3603---------------------------
wdenkc6097192002-11-03 00:24:07 +00003604
wdenk2729af92004-05-03 20:45:30 +00003605The implementation of U-Boot is complicated by the fact that U-Boot
3606starts running out of ROM (flash memory), usually without access to
3607system RAM (because the memory controller is not initialized yet).
3608This means that we don't have writable Data or BSS segments, and BSS
3609is not initialized as zero. To be able to get a C environment working
3610at all, we have to allocate at least a minimal stack. Implementation
3611options for this are defined and restricted by the CPU used: Some CPU
3612models provide on-chip memory (like the IMMR area on MPC8xx and
3613MPC826x processors), on others (parts of) the data cache can be
3614locked as (mis-) used as memory, etc.
wdenkc6097192002-11-03 00:24:07 +00003615
Wolfgang Denk218ca722008-03-26 10:40:12 +01003616 Chris Hallinan posted a good summary of these issues to the
wdenk2729af92004-05-03 20:45:30 +00003617 u-boot-users mailing list:
wdenk43d96162003-03-06 00:02:04 +00003618
wdenk2729af92004-05-03 20:45:30 +00003619 Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
3620 From: "Chris Hallinan" <clh@net1plus.com>
3621 Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
3622 ...
wdenk43d96162003-03-06 00:02:04 +00003623
wdenk2729af92004-05-03 20:45:30 +00003624 Correct me if I'm wrong, folks, but the way I understand it
3625 is this: Using DCACHE as initial RAM for Stack, etc, does not
3626 require any physical RAM backing up the cache. The cleverness
3627 is that the cache is being used as a temporary supply of
3628 necessary storage before the SDRAM controller is setup. It's
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003629 beyond the scope of this list to explain the details, but you
wdenk2729af92004-05-03 20:45:30 +00003630 can see how this works by studying the cache architecture and
3631 operation in the architecture and processor-specific manuals.
wdenk43d96162003-03-06 00:02:04 +00003632
wdenk2729af92004-05-03 20:45:30 +00003633 OCM is On Chip Memory, which I believe the 405GP has 4K. It
3634 is another option for the system designer to use as an
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003635 initial stack/RAM area prior to SDRAM being available. Either
wdenk2729af92004-05-03 20:45:30 +00003636 option should work for you. Using CS 4 should be fine if your
3637 board designers haven't used it for something that would
3638 cause you grief during the initial boot! It is frequently not
3639 used.
wdenk43d96162003-03-06 00:02:04 +00003640
wdenk2729af92004-05-03 20:45:30 +00003641 CFG_INIT_RAM_ADDR should be somewhere that won't interfere
3642 with your processor/board/system design. The default value
3643 you will find in any recent u-boot distribution in
Stefan Roese8a316c92005-08-01 16:49:12 +02003644 walnut.h should work for you. I'd set it to a value larger
wdenk2729af92004-05-03 20:45:30 +00003645 than your SDRAM module. If you have a 64MB SDRAM module, set
3646 it above 400_0000. Just make sure your board has no resources
3647 that are supposed to respond to that address! That code in
3648 start.S has been around a while and should work as is when
3649 you get the config right.
wdenk43d96162003-03-06 00:02:04 +00003650
wdenk2729af92004-05-03 20:45:30 +00003651 -Chris Hallinan
3652 DS4.COM, Inc.
wdenk43d96162003-03-06 00:02:04 +00003653
wdenk2729af92004-05-03 20:45:30 +00003654It is essential to remember this, since it has some impact on the C
3655code for the initialization procedures:
wdenkc6097192002-11-03 00:24:07 +00003656
wdenk2729af92004-05-03 20:45:30 +00003657* Initialized global data (data segment) is read-only. Do not attempt
3658 to write it.
wdenkc6097192002-11-03 00:24:07 +00003659
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003660* Do not use any uninitialized global data (or implicitely initialized
wdenk2729af92004-05-03 20:45:30 +00003661 as zero data - BSS segment) at all - this is undefined, initiali-
3662 zation is performed later (when relocating to RAM).
wdenkc6097192002-11-03 00:24:07 +00003663
wdenk2729af92004-05-03 20:45:30 +00003664* Stack space is very limited. Avoid big data buffers or things like
3665 that.
wdenkc6097192002-11-03 00:24:07 +00003666
wdenk2729af92004-05-03 20:45:30 +00003667Having only the stack as writable memory limits means we cannot use
3668normal global data to share information beween the code. But it
3669turned out that the implementation of U-Boot can be greatly
3670simplified by making a global data structure (gd_t) available to all
3671functions. We could pass a pointer to this data as argument to _all_
3672functions, but this would bloat the code. Instead we use a feature of
3673the GCC compiler (Global Register Variables) to share the data: we
3674place a pointer (gd) to the global data into a register which we
3675reserve for this purpose.
wdenkc6097192002-11-03 00:24:07 +00003676
wdenk2729af92004-05-03 20:45:30 +00003677When choosing a register for such a purpose we are restricted by the
3678relevant (E)ABI specifications for the current architecture, and by
3679GCC's implementation.
wdenkc6097192002-11-03 00:24:07 +00003680
wdenk2729af92004-05-03 20:45:30 +00003681For PowerPC, the following registers have specific use:
3682 R1: stack pointer
Wolfgang Denke7670f62008-02-14 22:43:22 +01003683 R2: reserved for system use
wdenk2729af92004-05-03 20:45:30 +00003684 R3-R4: parameter passing and return values
3685 R5-R10: parameter passing
3686 R13: small data area pointer
3687 R30: GOT pointer
3688 R31: frame pointer
wdenkc6097192002-11-03 00:24:07 +00003689
wdenk2729af92004-05-03 20:45:30 +00003690 (U-Boot also uses R14 as internal GOT pointer.)
wdenkc6097192002-11-03 00:24:07 +00003691
Wolfgang Denke7670f62008-02-14 22:43:22 +01003692 ==> U-Boot will use R2 to hold a pointer to the global data
wdenkc6097192002-11-03 00:24:07 +00003693
wdenk2729af92004-05-03 20:45:30 +00003694 Note: on PPC, we could use a static initializer (since the
3695 address of the global data structure is known at compile time),
3696 but it turned out that reserving a register results in somewhat
3697 smaller code - although the code savings are not that big (on
3698 average for all boards 752 bytes for the whole U-Boot image,
3699 624 text + 127 data).
wdenkc6097192002-11-03 00:24:07 +00003700
Mike Frysinger4c58eb52008-02-04 19:26:54 -05003701On Blackfin, the normal C ABI (except for P5) is followed as documented here:
3702 http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
3703
3704 ==> U-Boot will use P5 to hold a pointer to the global data
3705
wdenk2729af92004-05-03 20:45:30 +00003706On ARM, the following registers are used:
wdenkc6097192002-11-03 00:24:07 +00003707
wdenk2729af92004-05-03 20:45:30 +00003708 R0: function argument word/integer result
3709 R1-R3: function argument word
3710 R9: GOT pointer
3711 R10: stack limit (used only if stack checking if enabled)
3712 R11: argument (frame) pointer
3713 R12: temporary workspace
3714 R13: stack pointer
3715 R14: link register
3716 R15: program counter
wdenkc6097192002-11-03 00:24:07 +00003717
wdenk2729af92004-05-03 20:45:30 +00003718 ==> U-Boot will use R8 to hold a pointer to the global data
wdenkc6097192002-11-03 00:24:07 +00003719
Wolfgang Denkd87080b2006-03-31 18:32:53 +02003720NOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
3721or current versions of GCC may "optimize" the code too much.
wdenkc6097192002-11-03 00:24:07 +00003722
wdenk2729af92004-05-03 20:45:30 +00003723Memory Management:
3724------------------
wdenkc6097192002-11-03 00:24:07 +00003725
wdenk2729af92004-05-03 20:45:30 +00003726U-Boot runs in system state and uses physical addresses, i.e. the
3727MMU is not used either for address mapping nor for memory protection.
wdenkc6097192002-11-03 00:24:07 +00003728
wdenk2729af92004-05-03 20:45:30 +00003729The available memory is mapped to fixed addresses using the memory
3730controller. In this process, a contiguous block is formed for each
3731memory type (Flash, SDRAM, SRAM), even when it consists of several
3732physical memory banks.
wdenkc6097192002-11-03 00:24:07 +00003733
wdenk2729af92004-05-03 20:45:30 +00003734U-Boot is installed in the first 128 kB of the first Flash bank (on
3735TQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
3736booting and sizing and initializing DRAM, the code relocates itself
3737to the upper end of DRAM. Immediately below the U-Boot code some
3738memory is reserved for use by malloc() [see CFG_MALLOC_LEN
3739configuration setting]. Below that, a structure with global Board
3740Info data is placed, followed by the stack (growing downward).
wdenkc6097192002-11-03 00:24:07 +00003741
wdenk2729af92004-05-03 20:45:30 +00003742Additionally, some exception handler code is copied to the low 8 kB
3743of DRAM (0x00000000 ... 0x00001FFF).
wdenkc6097192002-11-03 00:24:07 +00003744
wdenk2729af92004-05-03 20:45:30 +00003745So a typical memory configuration with 16 MB of DRAM could look like
3746this:
wdenkc6097192002-11-03 00:24:07 +00003747
wdenk2729af92004-05-03 20:45:30 +00003748 0x0000 0000 Exception Vector code
3749 :
3750 0x0000 1FFF
3751 0x0000 2000 Free for Application Use
3752 :
3753 :
wdenkc6097192002-11-03 00:24:07 +00003754
wdenk2729af92004-05-03 20:45:30 +00003755 :
3756 :
3757 0x00FB FF20 Monitor Stack (Growing downward)
3758 0x00FB FFAC Board Info Data and permanent copy of global data
3759 0x00FC 0000 Malloc Arena
3760 :
3761 0x00FD FFFF
3762 0x00FE 0000 RAM Copy of Monitor Code
3763 ... eventually: LCD or video framebuffer
3764 ... eventually: pRAM (Protected RAM - unchanged by reset)
3765 0x00FF FFFF [End of RAM]
wdenkc6097192002-11-03 00:24:07 +00003766
3767
wdenk2729af92004-05-03 20:45:30 +00003768System Initialization:
3769----------------------
wdenkc6097192002-11-03 00:24:07 +00003770
wdenk2729af92004-05-03 20:45:30 +00003771In the reset configuration, U-Boot starts at the reset entry point
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003772(on most PowerPC systems at address 0x00000100). Because of the reset
wdenk2729af92004-05-03 20:45:30 +00003773configuration for CS0# this is a mirror of the onboard Flash memory.
3774To be able to re-map memory U-Boot then jumps to its link address.
3775To be able to implement the initialization code in C, a (small!)
3776initial stack is set up in the internal Dual Ported RAM (in case CPUs
3777which provide such a feature like MPC8xx or MPC8260), or in a locked
3778part of the data cache. After that, U-Boot initializes the CPU core,
3779the caches and the SIU.
wdenkc6097192002-11-03 00:24:07 +00003780
wdenk2729af92004-05-03 20:45:30 +00003781Next, all (potentially) available memory banks are mapped using a
3782preliminary mapping. For example, we put them on 512 MB boundaries
3783(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
3784on 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
3785programmed for SDRAM access. Using the temporary configuration, a
3786simple memory test is run that determines the size of the SDRAM
3787banks.
wdenkc6097192002-11-03 00:24:07 +00003788
wdenk2729af92004-05-03 20:45:30 +00003789When there is more than one SDRAM bank, and the banks are of
3790different size, the largest is mapped first. For equal size, the first
3791bank (CS2#) is mapped first. The first mapping is always for address
37920x00000000, with any additional banks following immediately to create
3793contiguous memory starting from 0.
wdenkc6097192002-11-03 00:24:07 +00003794
wdenk2729af92004-05-03 20:45:30 +00003795Then, the monitor installs itself at the upper end of the SDRAM area
3796and allocates memory for use by malloc() and for the global Board
3797Info data; also, the exception vector code is copied to the low RAM
3798pages, and the final stack is set up.
wdenkc6097192002-11-03 00:24:07 +00003799
wdenk2729af92004-05-03 20:45:30 +00003800Only after this relocation will you have a "normal" C environment;
3801until that you are restricted in several ways, mostly because you are
3802running from ROM, and because the code will have to be relocated to a
3803new address in RAM.
wdenkc6097192002-11-03 00:24:07 +00003804
3805
wdenk2729af92004-05-03 20:45:30 +00003806U-Boot Porting Guide:
3807----------------------
wdenkc6097192002-11-03 00:24:07 +00003808
wdenk2729af92004-05-03 20:45:30 +00003809[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
3810list, October 2002]
wdenkc6097192002-11-03 00:24:07 +00003811
3812
wdenk2729af92004-05-03 20:45:30 +00003813int main (int argc, char *argv[])
3814{
3815 sighandler_t no_more_time;
wdenkc6097192002-11-03 00:24:07 +00003816
wdenk2729af92004-05-03 20:45:30 +00003817 signal (SIGALRM, no_more_time);
3818 alarm (PROJECT_DEADLINE - toSec (3 * WEEK));
wdenkc6097192002-11-03 00:24:07 +00003819
wdenk2729af92004-05-03 20:45:30 +00003820 if (available_money > available_manpower) {
3821 pay consultant to port U-Boot;
wdenkc6097192002-11-03 00:24:07 +00003822 return 0;
3823 }
3824
wdenk2729af92004-05-03 20:45:30 +00003825 Download latest U-Boot source;
3826
3827 Subscribe to u-boot-users mailing list;
3828
3829 if (clueless) {
3830 email ("Hi, I am new to U-Boot, how do I get started?");
wdenkc6097192002-11-03 00:24:07 +00003831 }
3832
wdenk2729af92004-05-03 20:45:30 +00003833 while (learning) {
3834 Read the README file in the top level directory;
3835 Read http://www.denx.de/twiki/bin/view/DULG/Manual ;
3836 Read the source, Luke;
3837 }
wdenkc6097192002-11-03 00:24:07 +00003838
wdenk2729af92004-05-03 20:45:30 +00003839 if (available_money > toLocalCurrency ($2500)) {
3840 Buy a BDI2000;
3841 } else {
3842 Add a lot of aggravation and time;
3843 }
wdenkc6097192002-11-03 00:24:07 +00003844
wdenk2729af92004-05-03 20:45:30 +00003845 Create your own board support subdirectory;
wdenkc6097192002-11-03 00:24:07 +00003846
wdenk2729af92004-05-03 20:45:30 +00003847 Create your own board config file;
wdenk6aff3112002-12-17 01:51:00 +00003848
wdenk2729af92004-05-03 20:45:30 +00003849 while (!running) {
3850 do {
3851 Add / modify source code;
3852 } until (compiles);
3853 Debug;
3854 if (clueless)
3855 email ("Hi, I am having problems...");
3856 }
3857 Send patch file to Wolfgang;
wdenkc6097192002-11-03 00:24:07 +00003858
wdenk2729af92004-05-03 20:45:30 +00003859 return 0;
3860}
3861
3862void no_more_time (int sig)
3863{
3864 hire_a_guru();
3865}
wdenkc6097192002-11-03 00:24:07 +00003866
3867
wdenk2729af92004-05-03 20:45:30 +00003868Coding Standards:
3869-----------------
wdenkc6097192002-11-03 00:24:07 +00003870
wdenk2729af92004-05-03 20:45:30 +00003871All contributions to U-Boot should conform to the Linux kernel
Detlev Zundel2c051652006-09-01 15:39:02 +02003872coding style; see the file "Documentation/CodingStyle" and the script
3873"scripts/Lindent" in your Linux kernel source directory. In sources
3874originating from U-Boot a style corresponding to "Lindent -pcs" (adding
3875spaces before parameters to function calls) is actually used.
wdenk2729af92004-05-03 20:45:30 +00003876
Detlev Zundel2c051652006-09-01 15:39:02 +02003877Source files originating from a different project (for example the
3878MTD subsystem) are generally exempt from these guidelines and are not
3879reformated to ease subsequent migration to newer versions of those
3880sources.
3881
3882Please note that U-Boot is implemented in C (and to some small parts in
3883Assembler); no C++ is used, so please do not use C++ style comments (//)
3884in your code.
wdenk2729af92004-05-03 20:45:30 +00003885
3886Please also stick to the following formatting rules:
3887- remove any trailing white space
3888- use TAB characters for indentation, not spaces
3889- make sure NOT to use DOS '\r\n' line feeds
3890- do not add more than 2 empty lines to source files
3891- do not add trailing empty lines to source files
3892
3893Submissions which do not conform to the standards may be returned
3894with a request to reformat the changes.
wdenkc6097192002-11-03 00:24:07 +00003895
3896
wdenk2729af92004-05-03 20:45:30 +00003897Submitting Patches:
3898-------------------
wdenkc6097192002-11-03 00:24:07 +00003899
wdenk2729af92004-05-03 20:45:30 +00003900Since the number of patches for U-Boot is growing, we need to
3901establish some rules. Submissions which do not conform to these rules
3902may be rejected, even when they contain important and valuable stuff.
wdenkc6097192002-11-03 00:24:07 +00003903
wdenk90dc6702005-05-03 14:12:25 +00003904Patches shall be sent to the u-boot-users mailing list.
wdenkc6097192002-11-03 00:24:07 +00003905
Wolfgang Denk218ca722008-03-26 10:40:12 +01003906Please see http://www.denx.de/wiki/UBoot/Patches for details.
3907
wdenk2729af92004-05-03 20:45:30 +00003908When you send a patch, please include the following information with
3909it:
wdenkc6097192002-11-03 00:24:07 +00003910
wdenk2729af92004-05-03 20:45:30 +00003911* For bug fixes: a description of the bug and how your patch fixes
3912 this bug. Please try to include a way of demonstrating that the
3913 patch actually fixes something.
wdenkc6097192002-11-03 00:24:07 +00003914
wdenk2729af92004-05-03 20:45:30 +00003915* For new features: a description of the feature and your
3916 implementation.
wdenkc6097192002-11-03 00:24:07 +00003917
wdenk2729af92004-05-03 20:45:30 +00003918* A CHANGELOG entry as plaintext (separate from the patch)
3919
3920* For major contributions, your entry to the CREDITS file
3921
3922* When you add support for a new board, don't forget to add this
3923 board to the MAKEALL script, too.
3924
3925* If your patch adds new configuration options, don't forget to
3926 document these in the README file.
3927
Wolfgang Denk218ca722008-03-26 10:40:12 +01003928* The patch itself. If you are using git (which is *strongly*
3929 recommended) you can easily generate the patch using the
3930 "git-format-patch". If you then use "git-send-email" to send it to
3931 the U-Boot mailing list, you will avoid most of the common problems
3932 with some other mail clients.
wdenk2729af92004-05-03 20:45:30 +00003933
Wolfgang Denk218ca722008-03-26 10:40:12 +01003934 If you cannot use git, use "diff -purN OLD NEW". If your version of
3935 diff does not support these options, then get the latest version of
3936 GNU diff.
wdenk2729af92004-05-03 20:45:30 +00003937
Wolfgang Denk218ca722008-03-26 10:40:12 +01003938 The current directory when running this command shall be the parent
3939 directory of the U-Boot source tree (i. e. please make sure that
3940 your patch includes sufficient directory information for the
3941 affected files).
3942
3943 We prefer patches as plain text. MIME attachments are discouraged,
3944 and compressed attachments must not be used.
wdenk2729af92004-05-03 20:45:30 +00003945
3946* If one logical set of modifications affects or creates several
3947 files, all these changes shall be submitted in a SINGLE patch file.
3948
3949* Changesets that contain different, unrelated modifications shall be
3950 submitted as SEPARATE patches, one patch per changeset.
3951
3952
3953Notes:
3954
3955* Before sending the patch, run the MAKEALL script on your patched
3956 source tree and make sure that no errors or warnings are reported
3957 for any of the boards.
3958
3959* Keep your modifications to the necessary minimum: A patch
3960 containing several unrelated changes or arbitrary reformats will be
3961 returned with a request to re-formatting / split it.
3962
3963* If you modify existing code, make sure that your new code does not
3964 add to the memory footprint of the code ;-) Small is beautiful!
3965 When adding new features, these should compile conditionally only
3966 (using #ifdef), and the resulting code with the new feature
3967 disabled must not need more memory than the old code without your
3968 modification.
wdenk90dc6702005-05-03 14:12:25 +00003969
3970* Remember that there is a size limit of 40 kB per message on the
Wolfgang Denk218ca722008-03-26 10:40:12 +01003971 u-boot-users mailing list. Bigger patches will be moderated. If
3972 they are reasonable and not bigger than 100 kB, they will be
3973 acknowledged. Even bigger patches should be avoided.